MatrixMul
AnalysisLibErrType MatrixMul (void *matrixX, void *matrixY, ssize_t numberOfRowsInX, ssize_t colsRowsInXY, ssize_t numberOfColumnsInY, void *outputMatrix);
Purpose
Multiplies two 2D input matrices, X and Y. MatrixMul obtains the (i, j)th element of the output matrix, Z, using the formula:
i = matrix row index
j = matrix column index
k = number of columns/rows in X/Y
Ensure that the matrix sizes are valid for matrix multiplication. You must meet the following size constraints:
- matrixX must be n by k.
- matrixY must be k by m.
- outputMatrix must be n by m.
Example Code
/* Multiply two matrices. Note: A x B - B x A, in general. */
double x[10][20], y[20][15], z[10][15];
int n, k, m;
n = 10;
k = 20;
m = 15;
MatrixMul (x, y, n, k, m, z);
Parameters
| Input | ||
| Name | Type | Description |
| matrixX | void * | First matrix to multiply. The number of columns in matrixX must match the number of rows in matrixY. This matrix must be an array of doubles. |
| matrixY | void * | Second matrix to multiply. The number of columns of matrixX must match the number of rows of matrixY. This matrix must be an array of doubles. |
| OfRowsInX | ssize_t | The number of rows in matrixX. |
| colsRowsInXY | ssize_t | Number of columns in matrixX, which must be equal to the number of rows in matrixY. |
| OfColumnsInY | ssize_t | The number of columns in matrixY. |
| Output | ||
| Name | Type | Description |
| outputMatrix | void * | Result of the matrix multiplication, as an array of doubles. |
Return Value
| Name | Type | Description |
| status | AnalysisLibErrType | A value that specifies the type of error that occurred. Refer to analysis.h for definitions of these constants. |
Additional Information
Library: Analysis Library
Include file: analysis.h
LabWindows/CVI compatibility: LabWindows/CVI 3.0 and later