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1 /* |
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2 |
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3 Copyright (C) 2002, 2006, 2007 Kai Habel |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 3 of the License, or (at your |
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10 option) any later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, see |
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19 <http://www.gnu.org/licenses/>. |
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20 |
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21 */ |
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22 |
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include "defun-dld.h" |
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28 #include "error.h" |
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29 #include "gripes.h" |
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30 #include "oct-obj.h" |
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31 #include "utils.h" |
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32 #include "f77-fcn.h" |
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33 |
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34 extern "C" |
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35 { |
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36 F77_RET_T |
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37 F77_FUNC (dpchim, DPCHIM) (const octave_idx_type& n, double *x, double *f, |
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38 double *d, const octave_idx_type &incfd, |
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39 octave_idx_type *ierr); |
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40 } |
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41 |
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42 // Wrapper for SLATEC/PCHIP function DPCHIM to calculate the derivates |
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43 // for piecewise polynomials. |
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44 |
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45 DEFUN_DLD (__pchip_deriv__, args, , |
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46 "-*- texinfo -*-\n\ |
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47 @deftypefn {Loadable Function} {} __pchip_deriv__ (@var{x}, @var{y})\n\ |
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48 Undocumented internal function.\n\ |
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49 @end deftypefn") |
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50 { |
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51 octave_value retval; |
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52 const int nargin = args.length (); |
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53 |
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54 if (nargin == 2) |
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55 { |
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56 ColumnVector xvec (args(0).vector_value ()); |
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57 Matrix ymat (args(1).matrix_value ()); |
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58 |
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59 octave_idx_type nx = xvec.length (); |
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60 octave_idx_type nyr = ymat.rows (); |
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61 octave_idx_type nyc = ymat.columns (); |
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62 |
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63 if (nx != nyr) |
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64 { |
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65 error ("number of rows for x and y must match"); |
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66 return retval; |
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67 } |
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68 |
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69 ColumnVector dvec (nx), yvec (nx); |
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70 Matrix dmat (nyr, nyc); |
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71 |
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72 octave_idx_type ierr; |
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73 const octave_idx_type incfd = 1; |
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74 for (int c = 0; c < nyc; c++) |
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75 { |
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76 for (int r = 0; r < nx; r++) |
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77 yvec(r) = ymat(r,c); |
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78 |
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79 F77_FUNC (dpchim, DPCHIM) (nx, xvec.fortran_vec (), |
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80 yvec.fortran_vec (), |
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81 dvec.fortran_vec (), incfd, &ierr); |
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82 |
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83 if (ierr < 0) |
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84 { |
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85 error ("DPCHIM error: %i\n", ierr); |
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86 return retval; |
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87 } |
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88 |
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89 for (int r=0; r<nx; r++) |
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90 dmat(r,c) = dvec(r); |
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91 } |
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92 |
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93 retval = dmat; |
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94 } |
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95 |
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96 return retval; |
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97 } |
