Passing 2-D Arrays of unknown size ?

[Patricia Shanahan]

I have sometimes used a macro to represent an array, especially when mixing
Fortran and C. 

#define Array(i,j) array[(i)*cols+(j)]

   for(i ...)
       for(j ...)
           some_operation(Array(i,j));

With more complicated macros, it is possible to handle non-zero base arrays.

#define Array(i,j) array[((i)-istart)*cols+(j)-jstart]

And of course column-major rather than row-major:

#define Array(i,j) array[((j)-jstart)*rows+(i)-istart]

And strides:

#define Array(i,j) array[((i)-istart)*cols*istride+((j)-jstart)*jstride]


In all cases the reference looks like Array(i,j).
--
	Patricia Shanahan
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