219 lines
6.9 KiB
C
Executable File
219 lines
6.9 KiB
C
Executable File
/***********************************************************************
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* mexmat.c : C mex file
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*
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* M = mexmat(blk,x,isspM,rowidx,colidx,iscellM);
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*
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* SDPT3: version 3.0
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* Copyright (c) 1997 by
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* K.C. Toh, M.J. Todd, R.H. Tutuncu
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* Last Modified: 2 Feb 01
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***********************************************************************/
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#include <math.h>
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#include <mex.h>
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/**********************************************************
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* single block
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**********************************************************/
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void mat1(int n,
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const double *A, const int *irA, const int *jcA, int isspA,
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int mA, int colidx,
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double *B, int *irB, int *jcB, int isspB)
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{ int idx, i, j, r, jn, k, kstart, kend, idxj, j2, count;
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double tmp;
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if (!isspA & !isspB) {
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idx = colidx*mA;
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for (j=0; j<n; j++) {
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jn = j*n;
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for (i=0; i<n; i++) {
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B[i+jn] = A[idx];
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idx++; }
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}
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}
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else if (!isspA & isspB) {
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idx = colidx*mA;
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count = 0;
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for (j=0; j<n; j++) {
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for (i=0; i<n; i++) {
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tmp = A[idx];
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if (tmp != 0) { irB[count] = i; B[count] = tmp; count++; }
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idx++;
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}
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jcB[j+1] = count;
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}
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}
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else if (isspA & !isspB) {
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j2 = 0; idxj = 0;
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kstart = jcA[colidx]; kend = jcA[colidx+1];
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for (k=kstart; k<kend; k++) {
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r = irA[k];
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for (j=j2; j<n; j++) {i=r-idxj; if (i>=n) {idxj+=n;} else {break;}} j2=j;
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B[i+j*n] = A[k];
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}
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}
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else if (isspA & isspB) {
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count = 0;
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j2 = 0; idxj = 0;
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kstart = jcA[colidx]; kend = jcA[colidx+1];
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for (k=kstart; k<kend; k++) {
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r = irA[k];
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for (j=j2; j<n; j++) {i=r-idxj; if (i>=n) {idxj+=n;} else {break;}} j2=j;
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irB[count] = i;
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B[count] = A[k];
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++jcB[j+1];
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count++;
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}
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for (j=0; j<n; j++) { jcB[j+1] += jcB[j]; }
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}
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return;
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}
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/**********************************************************
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* B is sparse
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* multiple sub-blocks
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**********************************************************/
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void mat2(int n, const int numblk, const int *cumblksize, const int *blknnz,
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const double *A, int mA, int colidx,
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double *B, int *irB, int *jcB, int isspB)
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{ int idx, i, j, r, jn, k, kstart, kend, idxj, j2, count;
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int t, t2, istart, jstart, jend, rowidx, nsub;
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double tmp;
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idx = 0;
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jstart = 0; jend = 0; jcB[0]=0;
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for (t=0; t<numblk; t++) {
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jend = cumblksize[t+1];
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istart = jstart;
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idxj = colidx*mA;
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nsub = jend-jstart;
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for (j=jstart; j<jend; j++){
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idxj = (j-jstart)*nsub;
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rowidx = blknnz[t]-istart+idxj;
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for (i=jstart; i<jend; i++) {
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irB[idx] = i; B[idx] = A[rowidx+i]; idx++; }
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jcB[j+1] = idx;
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}
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jstart = jend;
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}
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return;
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}
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/**********************************************************
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*
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***********************************************************/
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void mexFunction(
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int nlhs, mxArray *plhs[],
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int nrhs, const mxArray *prhs[] )
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{
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mxArray *blk_cell_pr, *A_cell_pr;
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double *A, *B, *blksize, *Atmp;
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int *irA, *jcA, *irB, *jcB;
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int *cumblksize, *blknnz;
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int iscellA, mblk, mA, nA, m1, n1, rowidx, colidx, isspA, isspB;
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int subs[2];
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int nsubs=2;
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int n, n2, k, nsub, index, numblk, NZmax, r, kstart, kend;
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/* CHECK FOR PROPER NUMBER OF ARGUMENTS */
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if (nrhs < 2){
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mexErrMsgTxt("mexsmat: requires at least 2 input arguments."); }
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else if (nlhs>1){
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mexErrMsgTxt("mexsmat: requires 1 output argument."); }
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/* CHECK THE DIMENSIONS */
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iscellA = mxIsCell(prhs[1]);
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if (iscellA) { mA = mxGetM(prhs[1]); nA = mxGetN(prhs[1]); }
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else { mA = 1; nA = 1; }
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if (mxGetM(prhs[0]) != mA) {
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mexErrMsgTxt("mexsmat: blk and Avec not compatible"); }
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/***** main body *****/
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if (nrhs > 3) {rowidx = (int)*mxGetPr(prhs[3]); } else {rowidx = 1;}
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if (rowidx > mA) {
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mexErrMsgTxt("mexsmat: rowidx exceeds size(Avec,1)."); }
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subs[0] = rowidx-1; /* subtract 1 to adjust for Matlab index */
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subs[1] = 1;
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index = mxCalcSingleSubscript(prhs[0],nsubs,subs);
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blk_cell_pr = mxGetCell(prhs[0],index);
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numblk = mxGetN(blk_cell_pr);
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blksize = mxGetPr(blk_cell_pr);
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cumblksize = mxCalloc(numblk+1,sizeof(int));
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blknnz = mxCalloc(numblk+1,sizeof(int));
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cumblksize[0] = 0; blknnz[0] = 0;
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n = 0; n2 = 0;
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for (k=0; k<numblk; ++k) {
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nsub = (int) blksize[k];
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n += nsub;
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n2 += nsub*nsub;
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cumblksize[k+1] = n;
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blknnz[k+1] = n2;
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}
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/***** assign pointers *****/
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if (iscellA) {
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subs[0] = rowidx-1;
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subs[1] = 0;
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index = mxCalcSingleSubscript(prhs[1],nsubs,subs);
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A_cell_pr = mxGetCell(prhs[1],index);
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A = mxGetPr(A_cell_pr);
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m1 = mxGetM(A_cell_pr);
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n1 = mxGetN(A_cell_pr);
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isspA = mxIsSparse(A_cell_pr);
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if (isspA) { irA = mxGetIr(A_cell_pr);
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jcA = mxGetJc(A_cell_pr); }
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}
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else {
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A = mxGetPr(prhs[1]);
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m1 = mxGetM(prhs[1]);
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n1 = mxGetN(prhs[1]);
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isspA = mxIsSparse(prhs[1]);
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if (isspA) { irA = mxGetIr(prhs[1]);
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jcA = mxGetJc(prhs[1]); }
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}
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if (numblk > 1)
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{ isspB = 1; }
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else {
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if (nrhs > 2) {isspB = (int)*mxGetPr(prhs[2]);} else {isspB = isspA;}
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}
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if (nrhs > 4) {colidx = (int)*mxGetPr(prhs[4]) -1;} else {colidx = 0;}
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if (colidx > n1) {
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mexErrMsgTxt("mexsmat: colidx exceeds size(Avec,2).");
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}
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/***** create return argument *****/
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if (isspB) {
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if (numblk == 1 & isspA) {
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NZmax = jcA[colidx+1]-jcA[colidx]; }
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else {
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NZmax = blknnz[numblk];
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}
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plhs[0] = mxCreateSparse(n,n,NZmax,mxREAL);
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B = mxGetPr(plhs[0]);
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irB = mxGetIr(plhs[0]);
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jcB = mxGetJc(plhs[0]); }
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else {
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plhs[0] = mxCreateDoubleMatrix(n,n,mxREAL);
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B = mxGetPr(plhs[0]);
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}
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/***** Do the computations in a subroutine *****/
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if (numblk == 1) {
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mat1(n,A,irA,jcA,isspA,m1,colidx,B,irB,jcB,isspB); }
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else {
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if (isspA) {
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/** Atmp = mxGetPr(mxCreateDoubleMatrix(blknnz[numblk],1,mxREAL)); **/
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Atmp = mxCalloc(blknnz[numblk],sizeof(double));
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kstart = jcA[colidx]; kend = jcA[colidx+1];
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for (k=kstart; k<kend; k++) { r = irA[k]; Atmp[r] = A[k]; }
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mat2(n,numblk,cumblksize,blknnz,Atmp,m1,0,B,irB,jcB,isspB); }
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else {
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mat2(n,numblk,cumblksize,blknnz,A,m1,colidx,B,irB,jcB,isspB); }
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}
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return;
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}
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/**********************************************************/
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