In FORTRAN and in the parameter section of the C3D file, arrays are stored in column order, i.e. the array
C11 C12 C13
C21 C22 C23
is stored serially in the order C11, C21, C12, C22, C13, and C23. In FORTRAN and C3D parameter notation these elements are written as C(1,1), C(2,1), C(1,2), C(22), C(1,3), C(2,3), and the array is dimensioned as C(2,3).
In programming environments derived from C and C++, an array storing the elements in the same serial order is defined as c , with the 2nd subscript varying most rapidly.