Tried to change the diagonal elements of a magic square. Could not understand the error message.

    a= magic(6), diag(a)=[1 0 2 0 3 4]

Error message that I got was "Subscripted assignment dimension mismatch".

Do not understand why this happened, when you can easily replace a column or row of the matrix with similar syntax.

Answer 1

[Matt J]

You cannot put a function call on the left hand side of an assignment statement. Do this instead,

 a(1:7:end)=[1 0 2 0 3 4]