File: BI_smvcopy.c

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blacs-mpi 1.1-28.2
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#include "Bdef.h"
void BI_smvcopy(int m, int n, float *A, int lda, float *buff)
/*
 * Performs a matrix to vector copy (pack) for the data type float
 */
{
   int i, j;

   if ( (m == lda) || (n == 1) )
   {
      m = n * m;
      for (i=0; i < m; i++) buff[i] = A[i];
   }
   else if (m == 1)
   {
      for (j=0; j < n; j++) buff[j] = A[j*lda];
   }
   else
   {
      for (j=0; j < n; j++)
      {
         for (i=0; i < m; i++) buff[i] = A[i];
         A += lda;
         buff += m;
      }
   }
}