comparison toolboxes/FullBNT-1.0.7/KPMtools/rectintSparseLoopC.c @ 0:cc4b1211e677 tip

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+/* This is based on
+http://www.mathworks.com/access/helpdesk/help/techdoc/matlab_external/ch04cr12.shtml
+
+See rectintSparse.m for the matlab version of this code.
+
+*/
+
+#include <math.h> /* Needed for the ceil() prototype. */
+#include "mex.h"
+#include <stdio.h>
+
+/* If you are using a compiler that equates NaN to be zero, you 
+ * must compile this example using the flag  -DNAN_EQUALS_ZERO.
+ * For example:
+ *
+ *     mex -DNAN_EQUALS_ZERO fulltosparse.c
+ *
+ * This will correctly define the IsNonZero macro for your C
+ * compiler.
+ */
+
+#if defined(NAN_EQUALS_ZERO)
+#define IsNonZero(d) ((d) != 0.0 || mxIsNaN(d))
+#else
+#define IsNonZero(d) ((d) != 0.0)
+#endif
+
+#define MAX(x,y)  ((x)>(y) ? (x) : (y))
+#define MIN(x,y)  ((x)<(y) ? (x) : (y))
+
+void mexFunction(
+        int nlhs,       mxArray *plhs[],
+        int nrhs, const mxArray *prhs[]
+        )
+{
+  /* Declare variables. */
+  int j,k,m,n,nzmax,*irs,*jcs, *irs2, *jcs2;
+  double *overlap, *overlap2, tmp, areaA, areaB;
+  double percent_sparse;
+  double *leftA, *rightA, *topA, *bottomA;
+  double *leftB, *rightB, *topB, *bottomB;
+  double *verbose;
+
+  /* Get the size and pointers to input data. */
+  m = MAX(mxGetM(prhs[0]), mxGetN(prhs[0]));
+  n = MAX(mxGetM(prhs[4]), mxGetN(prhs[4]));
+  /* printf("A=%d, B=%d\n", m, n); */
+
+  leftA = mxGetPr(prhs[0]);
+  rightA = mxGetPr(prhs[1]);
+  topA = mxGetPr(prhs[2]);
+  bottomA = mxGetPr(prhs[3]);
+
+  leftB = mxGetPr(prhs[4]);
+  rightB = mxGetPr(prhs[5]);
+  topB = mxGetPr(prhs[6]);
+  bottomB = mxGetPr(prhs[7]);
+
+  verbose = mxGetPr(prhs[8]);
+
+    /* Allocate space for sparse matrix. 
+     * NOTE:  Assume at most 20% of the data is sparse.  Use ceil
+     * to cause it to round up. 
+     */
+
+  percent_sparse = 0.01;
+  nzmax = (int)ceil((double)m*(double)n*percent_sparse);
+
+  plhs[0] = mxCreateSparse(m,n,nzmax,0);
+  overlap  = mxGetPr(plhs[0]);
+  irs = mxGetIr(plhs[0]);
+  jcs = mxGetJc(plhs[0]);
+
+  plhs[1] = mxCreateSparse(m,n,nzmax,0);
+  overlap2  = mxGetPr(plhs[1]);
+  irs2 = mxGetIr(plhs[1]);
+  jcs2 = mxGetJc(plhs[1]);
+
+    
+  /* Assign nonzeros. */
+  k = 0; 
+  for (j = 0; (j < n); j++) {
+    int i;
+    jcs[j] = k; 
+    jcs2[j] = k; 
+    for (i = 0; (i < m); i++) {
+      tmp = (MAX(0, MIN(rightA[i], rightB[j]) - MAX(leftA[i], leftB[j]) )) * 
+	(MAX(0, MIN(topA[i], topB[j]) - MAX(bottomA[i], bottomB[j]) ));
+      
+      if (*verbose) {
+	printf("j=%d,i=%d,tmp=%5.3f\n", j,i,tmp);
+      }
+
+      if (IsNonZero(tmp)) {
+
+        /* Check to see if non-zero element will fit in 
+         * allocated output array.  If not, increase
+         * percent_sparse by 20%, recalculate nzmax, and augment
+         * the sparse array.
+         */
+        if (k >= nzmax) {
+          int oldnzmax = nzmax;
+          percent_sparse += 0.2;
+          nzmax = (int)ceil((double)m*(double)n*percent_sparse);
+
+          /* Make sure nzmax increases atleast by 1. */
+          if (oldnzmax == nzmax) 
+            nzmax++;
+	  printf("reallocating from %d to %d\n", oldnzmax, nzmax);
+
+          mxSetNzmax(plhs[0], nzmax); 
+          mxSetPr(plhs[0], mxRealloc(overlap, nzmax*sizeof(double)));
+          mxSetIr(plhs[0], mxRealloc(irs, nzmax*sizeof(int)));
+          overlap  = mxGetPr(plhs[0]);
+          irs = mxGetIr(plhs[0]);
+
+          mxSetNzmax(plhs[1], nzmax); 
+          mxSetPr(plhs[1], mxRealloc(overlap2, nzmax*sizeof(double)));
+          mxSetIr(plhs[1], mxRealloc(irs2, nzmax*sizeof(int)));
+          overlap2  = mxGetPr(plhs[1]);
+          irs2 = mxGetIr(plhs[1]);
+        }
+
+        overlap[k] = tmp;
+        irs[k] = i;
+	
+	areaA = (rightA[i]-leftA[i])*(topA[i]-bottomA[i]);
+	areaB = (rightB[j]-leftB[j])*(topB[j]-bottomB[j]);
+	overlap2[k] = MIN(tmp/areaA, tmp/areaB);
+	irs2[k] = i;
+
+        k++;
+      } /* IsNonZero */
+    } /* for i */
+  }
+  jcs[n] = k;
+  jcs2[n] = k;
+  
+}
+
+
+
+
+
+
+
+