comparison Problems/private/addtocols.c @ 10:207a6ae9a76f version1.0

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+/**************************************************************************
+ *
+ * File name: addtocols.c
+ *
+ * Ron Rubinstein
+ * Computer Science Department
+ * Technion, Haifa 32000 Israel
+ * ronrubin@cs
+ *
+ * Last Updated: 19.4.2009
+ *
+ *************************************************************************/
+
+
+#include "mex.h"
+
+
+/* Input Arguments */
+
+#define	X_IN	prhs[0]
+#define V_IN  prhs[1]
+
+
+/* Output Arguments */
+
+#define	Y_OUT	plhs[0]
+
+
+void mexFunction(int nlhs, mxArray *plhs[], 
+		             int nrhs, const mxArray*prhs[])
+     
+{ 
+    double *x, *y, *v, *xend;  
+    mwSize m,n,m1,n1;
+    mwIndex counter; 
+    
+    
+    /* Check for proper number of arguments */
+    
+    if (nrhs != 2) {
+      mexErrMsgTxt("Two input arguments required."); 
+    } else if (nlhs > 1) {
+      mexErrMsgTxt("Too many output arguments."); 
+    } 
+    
+    
+    /* Check the the input dimensions */ 
+    
+    m = mxGetM(X_IN);
+    n = mxGetN(X_IN);
+    if (!mxIsDouble(X_IN) || mxIsComplex(X_IN) || mxGetNumberOfDimensions(X_IN)>2) {
+      mexErrMsgTxt("ADDTOCOLS requires that X be a double matrix.");
+    }
+    m1 = mxGetM(V_IN);
+    n1 = mxGetN(V_IN);
+    if (!mxIsDouble(V_IN) || mxIsComplex(V_IN) || (m1!=1 && n1!=1)) {
+      mexErrMsgTxt("ADDTOCOLS requires that V be a double vector.");
+    }
+    if ((m1==1 && n1!=n) || (n1==1 && m1!=n)) {
+      mexErrMsgTxt("Error in ADDTOCOLS: dimensions of V and X must agree.");
+    }
+    
+    
+    /* Create a matrix for the return argument */ 
+    Y_OUT = mxCreateDoubleMatrix(m, n, mxREAL);
+         
+    
+    /* Assign pointers to the various parameters */ 
+    x = mxGetPr(X_IN); 
+    v = mxGetPr(V_IN);
+    y = mxGetPr(Y_OUT);
+            
+    
+    /* Do the actual computation */
+    
+    xend = x+(m*n);
+    counter = 0;
+    while (x<xend) {
+      (*y) = (*x) + (*v);
+      y++; x++; counter++;
+      if (counter==m) {v++; counter=0;}
+    }
+    
+    return;
+}