How to Convert a Multidimensional Array to a Pointer for Matrix Inversion in C ?

Converting Multidimensional Arrays to Pointers in C

Given a multidimensional array represented as double[4][4], the goal is to convert it into a double pointer compatible with a function that takes the inverse of a matrix.

Problem:

Attempting to convert the array directly using (double**)startMatrix does not yield the desired result.

Solution:

Since a double[4][4] array is incompatible with a double pointer, an alternative approach is necessary.

Create temporary index arrays of type double *[4] that point to the beginning of each row in the original arrays:

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

Pass these index arrays to the function instead:

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

Once the inversion is complete, the result will be stored in the original inverseMatrix array.

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