mtimes.h File Reference

A MATLAB Coder helper function for matrix multiplication. More...

#include "rtwtypes.h"
#include <stddef.h>
#include <stdlib.h>

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Functions
int	mtimes (const double A_data[], const int A_size[2], const double B_data[], double C_data[])
	Performs matrix multiplication: C = A * B.

Detailed Description

A MATLAB Coder helper function for matrix multiplication.

Author

Francesco Abate, MSA (Originally generated by MATLAB Coder)

Version

24.2 (MATLAB Coder version)

Date

2024-12-03

This auto-generated helper file from MATLAB Coder provides a C equivalent of MATLAB's mtimes (matrix multiplication *) operator. It calculates the product of two matrices, C = A * B.

The function is designed to handle matrix multiplication where dimensions are passed as arguments, a common pattern in code generated from MATLAB. It is used as a low-level utility by more complex control algorithms.

Definition in file mtimes.h.

Function Documentation

mtimes()

int mtimes	(	const double	A_data[],
		const int	A_size[2],
		const double	B_data[],
		double	C_data[]
	)

Performs matrix multiplication: C = A * B.

This function multiplies an M-by-N matrix A with an N-by-P matrix B to produce an M-by-P matrix C. The inner dimensions of A and B must match.

Parameters

[in]	A_data	A 1D array representing the first input matrix, A (row-major).
[in]	A_size	An array of 2 integers specifying the dimensions of A as [rows, cols].
[in]	B_data	A 1D array representing the second input matrix, B (row-major). (Note: Its size is inferred from A's dimensions).
[out]	C_data	A pre-allocated 1D array where the resulting output matrix C will be stored.

Returns

The size of the first dimension (number of rows) of the resulting matrix C.

Definition at line 23 of file mtimes.c.

{
  int C_size;
  int b_i;
  int i;
  int k;
  C_size = A_size[0];
  i = A_size[1];
  if (A_size[0] - 1 >= 0) {
    C_data[0] = 0.0;
  }
  for (k = 0; k < i; k++) {
    for (b_i = 0; b_i < C_size; b_i++) {
      C_data[0] += A_data[0] * B_data[0];
    }
  }
  return C_size;
}

Referenced by cdEvaluation().

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