HOW to create 4D array and 3D array

please help me to form 4D array for corresponding code of fortran REAL*8 C(-500:500,-500:500,1:4,1:4) and 3D array for REAL*8 C1(0:500,-500:500,1:4) in matlab

Answer 1

[James Tursa]

Fortran allows negative and 0 indexing, but MATLAB does not. There is no double class equivalent of this in MATLAB. You would have to create an array of the same size with positive indexing and manually adjust the indexing algorithms in your code. E.g., the Fortran code

REAL*8 C(-500:500,-500:500,1:4,1:4)

might be this in MATLAB

C = zeros(1001,1001,4,4);

and a Fortran indexing of C(-500,0,2,3) would be C(1,501,2,3) in MATLAB. I.e., Fortran C(i,j,k,m) becomes C(i+501,j+501,k,m) in MATLAB.

You could create a user-defined class to do this indexing adjustment, but it would take a bit of work and may not be worth it.