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1 /* |
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2 |
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3 Copyright (C) 2002 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 2, or (at your option) any |
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10 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, write to the Free |
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19 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 #ifdef HAVE_CONFIG_H |
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25 #include <config.h> |
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26 #endif |
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27 |
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28 #include "defun-dld.h" |
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29 #include "error.h" |
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30 #include "gripes.h" |
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31 #include "oct-obj.h" |
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32 #include "utils.h" |
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33 #include "f77-fcn.h" |
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34 |
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35 extern "C" |
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36 { |
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37 extern int F77_FUNC (dpchim, DPCHIM) |
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38 (const int &n, double *x, double *f, double *d, const int &incfd, |
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39 int *ierr); |
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40 } |
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41 |
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42 DEFUN_DLD(__pchip_deriv__, args, , |
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43 "-*- texinfo -*-\n\ |
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44 @deftypefn {Loadable Function} {} __pchip_deriv__ (@var{x}, @var{y})\n\ |
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45 Wrapper for SLATEC/PCHIP function DPCHIM to calculate the derivates for\n\ |
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46 piecewise polynomials. You should be using @code{pchip} function instead.\n\ |
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47 @end deftypefn") |
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48 { |
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49 octave_value retval; |
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50 const int nargin = args.length (); |
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51 |
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52 if (nargin == 2) |
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53 { |
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54 ColumnVector xvec (args(0).vector_value ()); |
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55 Matrix ymat (args(1).matrix_value ()); |
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56 |
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57 int nx = xvec.length (); |
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58 int nyr = ymat.rows (); |
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59 int nyc = ymat.columns (); |
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60 |
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61 if (nx != nyr) |
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62 { |
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63 error ("number of rows for x and y must match"); |
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64 return retval; |
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65 } |
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66 |
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67 ColumnVector dvec (nx), yvec (nx); |
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68 Matrix dmat (nyr, nyc); |
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69 |
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70 int ierr; |
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71 const int incfd = 1; |
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72 for (int c = 0; c < nyc; c++) |
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73 { |
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74 for (int r = 0; r < nx; r++) |
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75 yvec(r) = ymat(r,c); |
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76 |
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77 F77_FUNC (dpchim, DPCHIM) (nx, xvec.fortran_vec (), |
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78 yvec.fortran_vec (), |
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79 dvec.fortran_vec (), incfd, &ierr); |
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80 |
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81 if (ierr < 0) |
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82 { |
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83 error ("DPCHIM error: %i\n", ierr); |
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84 return retval; |
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85 } |
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86 |
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87 for (int r=0; r<nx; r++) |
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88 dmat(r,c) = dvec(r); |
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89 } |
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90 |
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91 retval = dmat; |
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92 } |
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93 |
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94 return retval; |
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95 } |
