# A Description problem of matrix

## A Description problem of matrix

Hi:
I use ipp lib to do matrix operation in Visual C++ 6.0, but there is a parameter making me confused, for example, I use "ippmInvert_m_64f_5x5" then I need to enter the parameter "srcStride".
Is "srcStride" eaqual 5 ? or other intger?
can you give me an guide?
thank you so much~

3 posts / 0 new
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Hi, did you looked through IPP manual? I believe the concept of matrix in IPP is described here.

Regards,

BTW, developer provided simple sample for you, which should demonstrate the way of using this function

Code:

```#include
#include

IppStatus ippmInvert_m_64f_5x5 (const Ipp64f* pSrc, Ipp32s srcStride1, Ipp64f*
pDst, Ipp32s dstStride1)
{
Ipp64f pBuffer[5*5+5]; /* Buffer location */

return ippmInvert_m_64f(pSrc, srcStride1, sizeof(Ipp64f), pBuffer,
pDst, dstStride1, sizeof(Ipp64f), 5);
}

void printf_m_Ipp64f(const char* msg, Ipp64f* buf,
int width, int height, IppStatus st );

/*
// Example demonstrates how to use the function iinvert_m_64f_5x5
//
// Standard description for source and destination matrices
*/
int main(){
int widthHeight = 5;
/* Source matrix with widthHeight=5 */
Ipp64f pSrc[5*5] = { 1,  1, -1,  1, -1,
-1,  0,  2, -1,  1,
-1, -1,  2,  0, -1,
1, -1,  0,  1, -1,
-1, -1,  2,  1, -1};
int srcStride1  = 5*sizeof(Ipp64f);

/* Destination matrix with widthHeight=5 */
Ipp64f pDst[5*5];
int dstStride1 = 5*sizeof(Ipp64f);

IppStatus status = ippmInvert_m_64f_5x5 (pSrc, srcStride1, pDst, dstStride1);

printf_m_Ipp64f("Destination matrix:", pDst, 5, 5, status);
return status;
}

void printf_m_Ipp64f(const char* msg, Ipp64f* buf,
int width, int height, IppStatus st )
{   int i, j;
if( st < ippStsNoErr ) {
printf( "-- error %d, %s
", st, ippGetStatusString( st ));
} else {
printf("%s
", msg );
for( j=0; j <  height; j++) {
for( i=0; i < width; i++) {
printf("%f  ", buf[j*width+i]); }
printf("
"); } }
}

```

Regards,