OpenCV只支持对浮点数或复杂类型。

您正在创建有符号整型矩阵。

支持的类型有：

  CV_32FC1 //真正的浮动
 CV_32FC2 //复杂的浮动
 CV_64FC1 //真双double 
 CV_64FC2 / / complex double 
 

以下类似的代码可以工作：

  float dA [] = {
 1，2，3，
 4，5，6，
 6，5，4，
}; 
 Mat A = Mat（3,3，CV_32F，dA）; 
 Mat C = A.t（）* A; 
 

i need to multiply a matrix and its transpose but i get the following error :

"OpenCV Error: Assertion failed (type == B.type() && (type == CV_32FC1 || type == CV_64FC1 || type == CV_32FC2 || type == CV_64FC2)) in unknown function, file .. ....\src\opencv\modules\core\src\matmul.cpp, line 711"

here is the code:

int dA[] = {
     1,     2,     3,
     4,     5,     6,
     6,     5,     4,
    }; 
Mat A = Mat(3,3, CV_32S, dA );
Mat C = A.t()* A;

OpenCV only supports matrix multiplication for matrices of floating point real or complex types.

You are creating matrix of signed integer type.

Supported types are:

CV_32FC1 //real float
CV_32FC2 //complex float
CV_64FC1 //real double
CV_64FC2 //complex double

The following similar code will work:

float dA[] = {
     1,     2,     3,
     4,     5,     6,
     6,     5,     4,
    }; 
Mat A = Mat(3,3, CV_32F, dA );
Mat C = A.t()* A;