On 2/1/07, seb_kramm <[EMAIL PROTECTED]> wrote:

> Ceci est mon premier message sur cette liste.

Hello!

Not sure what you want -- but perhaps this helps.

A : matrix ([a/w, b/x], [c/y, d/z]);
num (A);
  => matrix([a/w,b/x],[c/y,d/z])
denom (A);
  => 1
matrixmap (num, A);
  => matrix([a, b], [c, d])
matrixmap (denom, A);
  => matrix([w, x], [y, z])

Most Maxima functions do not automatically process a list or matrix
element by element. The functions map and matrixmap apply a
function element by element.

> Quand j'extrait un des éléments, il apparait bien sous forme de fraction,
> mais toujours encadré par des crochets !!

Hmm. From this, it appears your matrix is a nested matrix --
a matrix with elements that are also matrices. Is that intentional?

Sorry, I can read a little French but I can't write it.

Hope this helps!

Robert Dodier

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