How to Convert Multidimensional Arrays to Pointers in C for Matrix Operations?

Converting Multidimensional Arrays to Pointers in C

In C , multidimensional arrays are not directly compatible with double pointers. When attempting to convert a double4 array to a double using the "obvious way," MatrixInversion((double)startMatrix, 4, (double)inverseMatrix), errors may occur.

The reason lies in the distinct ways multidimensional arrays and double pointers represent data. While double4 represents a 2D array in row-major form, double represents an array of double* pointers, each pointing to a row in the array.

To address this incompatibility, one can modify the function's interface or the structure of the array passed as an argument.

Modifying the Array Structure

To make the existing double4 array compatible with the function, create temporary "index" arrays of type double *[4] pointing to the beginnings of each row in each matrix:

<code class="cpp">double *startRows[4] = { startMatrix[0], startMatrix[1], startMatrix[2] , startMatrix[3] };
double *inverseRows[4] = { /* same thing here */ };</code>

Pass these "index" arrays instead:

<code class="cpp">MatrixInversion(startRows, 4, inverseRows);</code>

The function will correctly place the result into the original inverseMatrix array.

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