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 I = 1:N,
FOR J21KTHXR = 1:N,
A(I ,J ) = 1/(I +J-1);
FOR S = 1.0: -0.1: 0.0, END steps S with increments of -0.1
FOR E = EYE (N), ... END sets E to the unit N-vectors.