Matrix Data Representation

• Recall, C stores data in row-major form:

  • a11, a12, ..., a1n; a21, a22, ..., a2n; ...; am1, am2, ..., amn

• If using "pointer to array of pointers to rows" scheme in C, can reference entire rows by first index, e.g. 3rd row = a[2].

  • Recall in C array indices start at zero!!

• FORTRAN stores data in column-major form:

  • a11, a21, ..., am1; a12, a22, ..., am2; ...; a1n, a2n, ..., amn

Notes: