OpenCV学习——多通道矩阵的赋值和取值

#pragma comment( lib, "cxcore.lib" )
#include "cv.h"
#include <stdio.h>
void main()
{
//矩阵元素为三通道浮点数
CvMat* mat = cvCreateMat(3,3,CV_32FC3);
cvZero(mat);//将矩阵置0
//为矩阵元素赋值

//获得矩阵元素(0,0)的指针
float *p = (float*)cvPtr2D(mat, 0, 0);
//为矩阵赋值
for(int i = 0; i < 9; i++)
{
//为每个通道赋值
*p = (float)i*10;
p++;
*p = (float)i*10+1;
p++;
*p = (float)i*10+2;
p++;
}

//打印矩阵的值
p = (float*)cvPtr2D(mat, 0, 0);

for(i = 0; i < 9; i++)
{
printf("%2.1f,%2.1f,%2.1f\t",*p,*(p+1),*(p+2));
p+=3;
if((i+1) % 3 == 0)
printf("\n");
}
}