FOR

Repeat statements a specific number of times.

The general form of a FOR statement is

        FOR variable = expr, statement, ..., statement END

     The columns of the expression are stored one at a time in
     the variable and then the following statements, up to the
     END, are executed. The expression is often of the form X:Y,
     in which case its columns are simply scalars. Some examples
     (assume N has already been assigned a value).

          for R = 1:N
              for C = 1:N
                 A(R,C) = 1/(R+C-1);
             end
         end

    Step S with increments of -0.1
         for S = 1.0: -0.1: 0.0, do_some_task(S), end

    Set E to the unit N-vectors
         for E = eye(N), do_some_task(E), end

    Long loops are more memory efficient when the colon expression appears
    in the FOR statement since the index vector is never created.

    The BREAK statement can be used to terminate the loop prematurely.

    See also PARFOR, IF, WHILE, SWITCH, BREAK, CONTINUE, END, COLON.