Re: [Maxima-discuss] weird behavior of apply

[Robert D. <rob...@gm...>]

On 2014-09-29, Dimiter Prodanov <dim...@gm...> wrote:

> I tried this particular syntax because I want to pass named arguments.
> In my hypothesis some of the arguments may not have been assigned.
>
> i.e.  for a function f(x,y,z,w) I would like to pass only for example [x=1,
> z=2] in the code.

Here's one way.

  ev(f(x, y, z, w), [x = 1, z = 2]);
   => f(1, y, 2, w)

> I don't know if this is possible in Maxima. at and apply looked like
> good candidates for this scenario.

'at' works too. But note that the syntax is different from what you
tried before.

  at(f(x, y, z, w), [x = 1, z = 2]);
   => f(1, y, 2, w)

Note also you can construct 'at(...) noun expressions.

best

Robert Dodier