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annotate scripts/ode/private/integrate_const.m @ 20639:a260a6acb70f

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fix test failures introduced by a22d8a2eb0e5 * scripts/ode/private/integrate_adaptive.m: fix stepping backwards, fix invocation of OutputFcn, fix text of some error messages * scripts/ode/private/integrate_const.m: remove use of option OutputSave * scripts/ode/private/integrate_n_steps.m: remove use of option OutputSave
author Carlo de Falco <carlo.defalco@polimi.it>
date Sun, 11 Oct 2015 23:09:01 +0200
parents b7ac1e94266e
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ## Copyright (C) 2013, Roberto Porcu' <roberto.porcu@polimi.it>
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {[@var{t}, @var{y}] =} integrate_const (@var{@@stepper}, @var{@@fun}, @var{tspan}, @var{x0}, @var{dt}, @var{options})
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21 ##
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22 ## This function file can be called by an ODE solver function in order to
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23 ## integrate the set of ODEs on the interval @var{[t0,t1]} with a constant
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24 ## timestep @var{dt}.
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25 ##
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26 ## This function must be called with two output arguments: @var{t} and @var{y}.
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27 ## Variable @var{t} is a column vector and contains the time stamps, instead
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28 ## @var{y} is a matrix in which each column refers to a different unknown of
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29 ## the problem and the rows number is the same of @var{t} rows number so that
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30 ## each row of @var{y} contains the values of all unknowns at the time value
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31 ## contained in the corresponding row in @var{t}.
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32 ##
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33 ## The first input argument must be a function_handle or an inline function
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34 ## representing the stepper, that is the function responsible for step-by-step
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35 ## integration. This function discriminates one method from the others.
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36 ##
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37 ## The second input argument is the order of the stepper. It is needed to
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38 ## compute the adaptive timesteps.
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39 ##
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40 ## The third input argument is a function_handle or an inline function that
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41 ## defines the set of ODE:
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42 ##
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43 ## @ifhtml
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44 ## @example
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45 ## @math{y' = f(t,y)}
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46 ## @end example
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47 ## @end ifhtml
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48 ## @ifnothtml
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49 ## @math{y' = f(t,y)}.
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50 ## @end ifnothtml
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51 ##
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52 ## The third input argument is the time vector which defines integration
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53 ## interval, that is @var{[tspan(1),tspan(end)]} and all the intermediate
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54 ## elements are taken as times at which the solution is required.
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55 ##
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56 ## The fourth argument contains the initial conditions for the ODEs.
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57 ##
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58 ## The fifth input argument represents the fixed timestep and the last input
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59 ## argument contains some options that may be needed for the stepper.
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60 ## @end deftypefn
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61 ##
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62 ## @seealso{integrate_adaptive, integrate_n_steps}
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63
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64 function solution = integrate_const (stepper, func, tspan, x0, dt, options)
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65
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66 solution = struct ();
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67
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68 ## first values for time and solution
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69 t = tspan(1);
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70 x = x0(:);
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71
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72 vdirection = odeget (options, "vdirection", [], "fast");
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73 if (sign (dt) != vdirection)
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74 error ("OdePkg:InvalidArgument",
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75 "option 'InitialStep' has a wrong sign");
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76 endif
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77
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78 ## setting parameters
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79 k = length (tspan);
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80 counter = 2;
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81 comp = 0.0;
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82 tk = tspan(1);
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83 options.comp = comp;
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84
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85 ## Initialize the OutputFcn
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86 if (options.vhaveoutputfunction)
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87 if (options.vhaveoutputselection)
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88 solution.vretout = x(options.OutputSel,end);
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89 else
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90 solution.vretout = x;
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91 endif
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92 feval (options.OutputFcn, tspan, solution.vretout, "init",
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93 options.vfunarguments{:});
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94 endif
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95
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96 ## Initialize the EventFcn
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97 if (options.vhaveeventfunction)
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98 odepkg_event_handle (options.Events, t(end), x, "init",
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99 options.vfunarguments{:});
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100 endif
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101
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102 solution.vcntloop = 2;
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103 solution.vcntcycles = 1;
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104 #vu = vinit;
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105 #vk = vu.' * zeros(1,6);
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106 vcntiter = 0;
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107 solution.vunhandledtermination = true;
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108 solution.vcntsave = 2;
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109
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110 z = t;
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111 u = x;
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112 k_vals = feval (func, t , x, options.vfunarguments{:});
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113
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114 while (counter <= k)
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115 ## computing the integration step from t to t+dt
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116 [s, y, ~, k_vals] = stepper (func, z(end), u(:,end), dt, options, k_vals);
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
117
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
118 [tk, comp] = kahan (tk,comp, dt);
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
119 options.comp = comp;
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
120 s(end) = tk;
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
121
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
122 if (options.vhavenonnegative)
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
123 x(options.NonNegative,end) = abs (x(options.NonNegative,end));
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
124 y(options.NonNegative,end) = abs (y(options.NonNegative,end));
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
125 y_est(options.NonNegative,end) = abs (y_est(options.NonNegative,end));
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
126 endif
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
127
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
128 if (options.vhaveoutputfunction && options.vhaverefine)
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
129 vSaveVUForRefine = u(:,end);
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
130 endif
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
131
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
132 ## values on this interval for time and solution
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
133 z = [t(end);s];
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
134 u = [x(:,end),y];
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
135
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
136 ## if next tspan value is caught, update counter
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
137 if ((z(end) == tspan(counter))
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
138 || (abs (z(end) - tspan(counter)) /
20586
b7ac1e94266e maint: Further clean up of functions in ode/private dir.
Rik <rik@octave.org>
parents: 20584
diff changeset
139 (max (abs (z(end)), abs (tspan(counter)))) < 8*eps) )
20568
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
140 counter++;
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
141
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
142 ## if there is an element in time vector at which the solution is required
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
143 ## the program must compute this solution before going on with next steps
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
144 elseif (vdirection * z(end) > vdirection * tspan(counter) )
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
145 ## initializing counter for the following cycle
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
146 i = 2;
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
147 while (i <= length (z))
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
148
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
149 ## if next tspan value is caught, update counter
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
150 if ((counter <= k)
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
151 && (((z(i) == tspan(counter))
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
152 || (abs (z(i) - tspan(counter)) /
20586
b7ac1e94266e maint: Further clean up of functions in ode/private dir.
Rik <rik@octave.org>
parents: 20584
diff changeset
153 (max (abs (z(i)), abs (tspan(counter)))) < 8*eps))) )
20568
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
154 counter++;
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
155 endif
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
156 ## else, loop until there are requested values inside this subinterval
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
157 while ((counter <= k)
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
158 && vdirection * z(i) > vdirection * tspan(counter) )
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
159 ## add the interpolated value of the solution
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
160 u = [u(:,1:i-1),u(:,i-1) + (tspan(counter)-z(i-1))/(z(i)-z(i-1))* ...
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
161 (u(:,i)-u(:,i-1)),u(:,i:end)];
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
162 ## add the time requested
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
163 z = [z(1:i-1);tspan(counter);z(i:end)];
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
164
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
165 ## update counters
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
166 counter++;
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
167 i++;
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
168 endwhile
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
169
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
170 ## if new time requested is not out of this interval
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
171 if ((counter <= k)
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
172 && vdirection * z(end) > vdirection * tspan(counter))
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
173 ## update the counter
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
174 i++;
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
175 else
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
176 ## else, stop the cycle and go on with the next iteration
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
177 i = length (z)+1;
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
178 endif
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
179
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
180 endwhile
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
181 endif
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
182
20639
a260a6acb70f fix test failures introduced by a22d8a2eb0e5
Carlo de Falco <carlo.defalco@polimi.it>
parents: 20586
diff changeset
183
a260a6acb70f fix test failures introduced by a22d8a2eb0e5
Carlo de Falco <carlo.defalco@polimi.it>
parents: 20586
diff changeset
184 x = [x,u(:,2:end)];
a260a6acb70f fix test failures introduced by a22d8a2eb0e5
Carlo de Falco <carlo.defalco@polimi.it>
parents: 20586
diff changeset
185 t = [t;z(2:end)];
a260a6acb70f fix test failures introduced by a22d8a2eb0e5
Carlo de Falco <carlo.defalco@polimi.it>
parents: 20586
diff changeset
186 solution.vcntsave = solution.vcntsave + 1;
20568
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
187 solution.vcntloop = solution.vcntloop + 1;
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
188 vcntiter = 0;
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
189
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
190 ## Call plot only if a valid result has been found, therefore this
20584
eb9e2d187ed2 maint: Use Octave coding conventions in scripts/ode/private dir.
Rik <rik@octave.org>
parents: 20580
diff changeset
191 ## code fragment has moved here. Stop integration if plot function
20568
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
192 ## returns false
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
193 if (options.vhaveoutputfunction)
20584
eb9e2d187ed2 maint: Use Octave coding conventions in scripts/ode/private dir.
Rik <rik@octave.org>
parents: 20580
diff changeset
194 for vcnt = 0:options.Refine # Approximation between told and t
eb9e2d187ed2 maint: Use Octave coding conventions in scripts/ode/private dir.
Rik <rik@octave.org>
parents: 20580
diff changeset
195 if (options.vhaverefine) # Do interpolation
20568
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
196 vapproxtime = (vcnt + 1) / (options.Refine + 2);
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
197 vapproxvals = (1 - vapproxtime) * vSaveVUForRefine ...
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
198 + (vapproxtime) * y(:,end);
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
199 vapproxtime = s(end) + vapproxtime*dt;
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
200 else
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
201 vapproxvals = x(:,end);
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
202 vapproxtime = t(end);
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
203 endif
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
204 if (options.vhaveoutputselection)
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
205 vapproxvals = vapproxvals(options.OutputSel);
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
206 endif
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
207 vpltret = feval (options.OutputFcn, vapproxtime, vapproxvals, [],
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
208 options.vfunarguments{:});
20584
eb9e2d187ed2 maint: Use Octave coding conventions in scripts/ode/private dir.
Rik <rik@octave.org>
parents: 20580
diff changeset
209 if (vpltret) # Leave refinement loop
eb9e2d187ed2 maint: Use Octave coding conventions in scripts/ode/private dir.
Rik <rik@octave.org>
parents: 20580
diff changeset
210 break;
20568
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
211 endif
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
212 endfor
20584
eb9e2d187ed2 maint: Use Octave coding conventions in scripts/ode/private dir.
Rik <rik@octave.org>
parents: 20580
diff changeset
213 if (vpltret) # Leave main loop
20568
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
214 solution.vunhandledtermination = false;
20584
eb9e2d187ed2 maint: Use Octave coding conventions in scripts/ode/private dir.
Rik <rik@octave.org>
parents: 20580
diff changeset
215 break;
20568
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
216 endif
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
217 endif
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
218
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
219 ## Call event only if a valid result has been found, therefore this
20584
eb9e2d187ed2 maint: Use Octave coding conventions in scripts/ode/private dir.
Rik <rik@octave.org>
parents: 20580
diff changeset
220 ## code fragment has moved here. Stop integration if veventbreak is true
20568
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
221 if (options.vhaveeventfunction)
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
222 solution.vevent = odepkg_event_handle (options.Events, t(end), x(:,end),
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
223 [], options.vfunarguments{:});
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
224 if (! isempty (solution.vevent{1})
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
225 && solution.vevent{1} == 1)
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
226 t(solution.vcntloop-1,:) = solution.vevent{3}(end,:);
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
227 x(:,solution.vcntloop-1) = solution.vevent{4}(end,:)';
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
228 solution.vunhandledtermination = false;
20584
eb9e2d187ed2 maint: Use Octave coding conventions in scripts/ode/private dir.
Rik <rik@octave.org>
parents: 20580
diff changeset
229 break;
20568
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
230 endif
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
231 endif
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
232
fcb792acab9b Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
jcorno <jacopo.corno@gmail.com>
parents:
diff changeset
233 ## Update counters that count the number of iteration cycles
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234 solution.vcntcycles = solution.vcntcycles + 1; # Needed for cost statistics
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235 vcntiter = vcntiter + 1; # Needed to find iteration problems
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236
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237 ## Stop solving because the last 1000 steps no successful valid
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238 ## value has been found
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239 if (vcntiter >= 5000)
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240 error (["Solving has not been successful. The iterative",
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241 " integration loop exited at time t = %f before endpoint at",
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242 " tend = %f was reached. This happened because the iterative",
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243 " integration loop does not find a valid solution at this time",
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244 " stamp. Try to reduce the value of 'InitialStep' and/or",
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245 " 'MaxStep' with the command 'odeset'.\n"],
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246 s(end), tspan(end));
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247 endif
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248
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249 ## if this is the last iteration, save the length of last interval
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250 if (counter > k)
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251 j = length (z);
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252 endif
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253 endwhile
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254
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255 ## Check if integration of the ode has been successful
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256 if (vdirection * z(end) < vdirection * tspan(end))
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257 if (solution.vunhandledtermination == true)
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258 error ("OdePkg:InvalidArgument",
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259 ["Solving has not been successful. The iterative integration"
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260 " loop exited at time t = %f before endpoint at tend = %f was",
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261 " reached. This may happen if the stepsize grows smaller than",
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262 " defined in vminstepsize. Try to reduce the value of",
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263 " 'InitialStep' and/or 'MaxStep' with the command 'odeset'.\n"],
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264 z(end), tspan(end));
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265 else
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266 warning ("OdePkg:InvalidArgument",
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267 ["Solver has been stopped by a call of 'break' in the main",
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268 " iteration loop at time t = %f before endpoint at tend = %f",
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269 " was reached. This may happen because the @odeplot function",
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270 " returned 'true' or the @event function returned 'true'.\n"],
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271 z(end), tspan(end));
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272 endif
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273 endif
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274
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275 ## compute how many values are out of time inerval
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276 d = vdirection * t((end-(j-1)):end) > vdirection * tspan(end) * ones (j, 1);
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277 f = sum (d);
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278
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279 ## remove not-requested values of time and solution
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280 solution.t = t(1:end-f);
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281 solution.x = x(:,1:end-f)';
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282
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283 endfunction
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284