On Tue, 2007-04-17 at 13:49 +0000, Wolfgang Lindner wrote:
> [..] An alternate top level syntax has been provided for ev, whereby
> one may just type in
> its arguments, without the ev(). That is, one may write simply
> ---------------------------
> expr, arg_1, ..., arg_n
> --------------------------- "
that's right. I should have told you that I explain to the students that
expr, arg1,...,argn
is just an abbreviation for ev(expr,arg1,argn) that may be used only by
itself and not in any other combinations. For example, in the following
case ev( ) cannot be eliminated:
plot2d(ev(f,a=2), [x,-3,3])
Also, in the same lecture when I talk about that syntax I also introduce
the similar notation (and emphasize the differences):
(expr1,expr2,...,exprn)
which executes the n expressions and shows the result of the last one.
Regards,
Jaime