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Create local repository for matrix toolboxes. Step #0 done.
author Antonio Pino Robles <data.script93@gmail.com>
date Wed, 06 May 2015 14:56:53 +0200
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1 /*
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2 * C mex file for MATLAB that implements LAPACK ctrexc_ for
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3 * reordering the complex Schur decomposition A = UTU^* such that
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4 * T is in block form. This program combines Cswap and Crealswap
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5 * which deal with the complex and the real case respectively.
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6 *
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7 * Input matrices 'U' and 'T' are those from Schur decompositon
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8 *
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9 * Called by [U,T] = swap(U,T,M)
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10 *
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11 * The matrix M is produced using the m-files
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12 * >> m = blocking(T,noplot,delta); where delta is some tolerance
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13 * default: delta = 0.1;
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14 * >> [n,M,ind,totalswaps] = swapping5(m);
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15 *
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16 * Output matrices 'U' and 'T' are the updated Schur decomposition
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17 *
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18 */
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19
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20 #include "mex.h"
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21 #include "matrix.h"
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22 #include "fort.h" /* defines mat2fort and fort2mat */
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23
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24 void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
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25 {
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26
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27 /* compq=V then the matrix of Schur vectors is updated */
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28
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29 char *compq = "V", msg[80];
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30 int n, ldt, ldq, i, info, ifst, ilst, lengthm;
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31 double *t, *q, *m, *work;
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32 mxArray *mm;
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33
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34 /* expect 3 inputs and 2 outputs */
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35 if ((nrhs != 3) || (nlhs != 2)){
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36 mexErrMsgTxt("Expected 3 inputs and 2 outputs");
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37 }
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38
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39 /* Sizes of stuff */
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40
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41 n = mxGetN( prhs[0] );
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42 ldt = n;
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43 ldq = n;
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44 lengthm = mxGetM( prhs[2] );
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45
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46 /* Copy input and output matrices to stuff */
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47
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48 mm = mxDuplicateArray( prhs[2] );
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49 m = mxGetPr(mm);
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50
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51 if (mxIsComplex( prhs[1] )) {
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52
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53 /* Convert complex input to complex FORTRAN format */
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54
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55 q = mat2fort( prhs[0], ldq, n );
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56 t = mat2fort( prhs[1], ldt, n ); }
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57
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58 else {
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59
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60 plhs[0] = mxCreateDoubleMatrix(n,n,mxREAL);
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61 plhs[1] = mxCreateDoubleMatrix(n,n,mxREAL);
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62
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63 plhs[1] = mxDuplicateArray( prhs[1] );
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64 t = mxGetPr(plhs[1]);
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65 plhs[0] = mxDuplicateArray( prhs[0] );
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66 q = mxGetPr(plhs[0]);
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67 }
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68
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69 /* Allocate workspace */
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70
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71 work = (double *)mxCalloc(n,sizeof(double));
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72
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73 /* Do the loop */
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74
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75 for ( i = 0; i < lengthm; i++) {
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76 info = 0;
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77 ifst = m[lengthm + i];
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78 ilst = m[i];
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79 if (mxIsComplex( prhs[1] )) {
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80 ztrexc(compq,&n,t,&ldt,q,&ldq,&ifst,&ilst,&info); }
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81 else {
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82 dtrexc(compq,&n,t,&ldt,q,&ldq,&ifst,&ilst,work,&info);
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83 }
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84 if (info < 0){
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85 sprintf(msg, "The routine DTREXC has detected an error");
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86 mexErrMsgTxt(msg);
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87 }
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88 }
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89
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90 /* Convert output to MATLAB format */
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91
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92 if (mxIsComplex( prhs[1] )) {
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93 plhs[0] = fort2mat( q, ldq, ldq, n );
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94 plhs[1] = fort2mat( t, ldt, ldt, n );
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95 }
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96
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97 /* Free up memory */
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98
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99 mxFree(work);
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100 }
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101