Converting multidimensional arrays to pointers in c++

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No, there’s no right way to do specifically that. A double[4][4] array is not convertible to a double ** pointer. These are two alternative, incompatible ways to implement a 2D array. Something needs to be changed: either the function’s interface, or the structure of the array passed as an argument.

The simplest way to do the latter, i.e. to make your existing double[4][4] array compatible with the function, is to create temporary “index” arrays of type double *[4] pointing to the beginnings of each row in each matrix

double *startRows[4] = { startMatrix[0], startMatrix[1], startMatrix[2] , startMatrix[3] };
double *inverseRows[4] = { /* same thing here */ };

and pass these “index” arrays instead

MatrixInversion(startRows, 4, inverseRows);

Once the function finished working, you can forget about the startRows and inverseRows arrays, since the result will be placed into your original inverseMatrix array correctly.

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