Per documentation, 'remove' quotes its arguments, thus *perhaps *making it *
slightly* easier to use interactively, and definitely making it annoying
to use programmatically.
The workaround:
apply('remove, [ ydep , 'dependency ] )
On Tue, Oct 2, 2012 at 4:51 PM, Edwin Woollett <woollett at charter.net> wrote:
> I am trying to define diff1(expr, u,z) with a block
> function which declares inside the function that u
> depends on z, and after the needed work, tries to remove
> that dependency, also inside the block.
>
> The function definition is applied to the example
> submitted to the list by Ivo Welch in the thread:
> [1] enter (in console) ; [2] implicit functions
> using the depends method of Jaime Villate.
>
> remove does not work with the following def:
> (using xmaxima and ver. 5.28.0)
> ------------------------------**----
>
> (%i1) display2d:false$
>
> (%i2) dependencies;
> (%o2) []
>
> (%i3) diff1(expr,ydep,xindep) :=
> block([dexpr],
> depends(ydep,xindep),
> dexpr : diff(expr,xindep),
> remove (ydep, dependency),
> solve (dexpr, diff (ydep,xindep)))$
>
> (%i4) diff1(y+log(y)+x,y,x);
>
> (%o4) ['diff(y,x,1) = -y/(y+1)]
>
> (%i5) dependencies;
>
> (%o5) [y(x)]
>
> (%i6) remove (y, dependency);
> (%o6) done
>
> (%i7) dependencies;
> (%o7) []
> -----------------------------
>
> Ted Woollett
>
>
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