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annotate doc/interpreter/interpimages.m @ 20654:b65888ec820e draft default tip gccjit

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dmalcom gcc jit import
author Stefan Mahr <dac922@gmx.de>
date Fri, 27 Feb 2015 16:59:36 +0100
parents b439ccc9a162
children
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4197fc428c7d maint: Update copyright notices for 2015.
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1 ## Copyright (C) 2007-2015 David Bateman
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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 function interpimages (d, nm, typ)
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20 set_graphics_toolkit ();
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21 set_print_size ();
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22 hide_output ();
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23 outfile = fullfile (d, [nm "." typ]);
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24 if (strcmp (typ, "png"))
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25 set (0, "defaulttextfontname", "*");
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26 endif
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27 if (strcmp (typ, "eps"))
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28 d_typ = "-depsc2";
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29 else
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30 d_typ = ["-d", typ];
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31 endif
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32
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33 if (strcmp (typ, "txt"))
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34 image_as_txt (d, nm);
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35 elseif (strcmp (nm, "interpft"))
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36 t = 0 : 0.3 : pi; dt = t(2)-t(1);
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37 n = length (t); k = 100;
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38 ti = t(1) + [0 : k-1]*dt*n/k;
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39 y = sin (4*t + 0.3) .* cos (3*t - 0.1);
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40 yp = sin (4*ti + 0.3) .* cos (3*ti - 0.1);
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41 plot (ti, yp, "g", ti, interp1 (t, y, ti, "spline"), "b", ...
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42 ti, interpft (y, k), "c", t, y, "r+");
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43 legend ("sin(4t+0.3)cos(3t-0.1)", "spline", "interpft", "data");
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44 print (outfile, d_typ);
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45 elseif (strcmp (nm, "interpn"))
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46 x = y = z = -1:1;
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47 f = @(x,y,z) x.^2 - y - z.^2;
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48 [xx, yy, zz] = meshgrid (x, y, z);
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49 v = f (xx,yy,zz);
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50 xi = yi = zi = -1:0.1:1;
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51 [xxi, yyi, zzi] = ndgrid (xi, yi, zi);
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52 vi = interpn (x, y, z, v, xxi, yyi, zzi, "spline");
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53 mesh (zi, yi, squeeze (vi(1,:,:)));
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54 print (outfile, d_typ);
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55 elseif (strcmp (nm, "interpderiv1"))
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56 t = -2:2;
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57 dt = 1;
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58 ti =-2:0.025:2;
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59 dti = 0.025;
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60 y = sign (t);
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61 ys = interp1 (t,y,ti,"spline");
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62 yp = interp1 (t,y,ti,"pchip");
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63 plot (ti, ys,"r-", ti, yp,"g-");
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64 legend ("spline","pchip", 4);
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65 print (outfile, d_typ);
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66 elseif (strcmp (nm, "interpderiv2"))
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67 t = -2:2;
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68 dt = 1;
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69 ti =-2:0.025:2;
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70 dti = 0.025;
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71 y = sign (t);
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72 ddys = diff (diff (interp1 (t,y,ti,"spline"))./dti)./dti;
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73 ddyp = diff (diff (interp1 (t,y,ti,"pchip"))./dti)./dti;
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74 plot (ti(2:end-1),ddys,"r*", ti(2:end-1),ddyp,"g+");
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75 legend ("spline", "pchip");
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76 print (outfile, d_typ);
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77 endif
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78 hide_output ();
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79 endfunction
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80
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81 ## This function no longer sets the graphics toolkit; That is now done
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82 ## automatically by C++ code which will ordinarily choose 'qt', but might
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83 ## choose gnuplot on older systems. Only a complete lack of plotting is a
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84 ## problem.
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85 function set_graphics_toolkit ()
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86 if (isempty (available_graphics_toolkits ()))
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87 error ("no graphics toolkit available for plotting");
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88 endif
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89 endfunction
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90
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91 function set_print_size ()
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92 image_size = [5.0, 3.5]; # in inches, 16:9 format
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93 border = 0; # For postscript use 50/72
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94 set (0, "defaultfigurepapertype", "<custom>");
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95 set (0, "defaultfigurepaperorientation", "landscape");
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96 set (0, "defaultfigurepapersize", image_size + 2*border);
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97 set (0, "defaultfigurepaperposition", [border, border, image_size]);
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98 endfunction
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99
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100 ## Use this function before plotting commands and after every call to print
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101 ## since print() resets output to stdout (unfortunately, gnuplot can't pop
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102 ## output as it can the terminal type).
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103 function hide_output ()
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104 hf = figure (1, "visible", "off");
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105 endfunction
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106
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107 ## generate something for the texinfo @image command to process
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108 function image_as_txt (d, nm)
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109 fid = fopen (fullfile (d, [nm ".txt"]), "wt");
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110 fputs (fid, "\n");
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111 fputs (fid, "+---------------------------------+\n");
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112 fputs (fid, "| Image unavailable in text mode. |\n");
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113 fputs (fid, "+---------------------------------+\n");
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114 fclose (fid);
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115 endfunction
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116