How to prevent the immediaetly evaluation after substitute a variable
Subject: How to prevent the immediaetly evaluation after substitute a variable
From: Stavros Macrakis
Date: Mon, 23 Jan 2012 16:36:17 -0500
Ralf,
Let me just add to Barton's suggestion that the issue here isn't (in Maxima
terminology) "evaluation" (i.e. the substitution of variable values and
functions) but "simplification". The expression (2+3) is *simplified* to
5, just as (2*x+3*x) is *simplified* to 5*x.
-s
On Mon, Jan 23, 2012 at 15:27, Barton Willis <willisb at unk.edu> wrote:
> Try using box:
>
> (%i67) 2 * sqrt(box(h));
> (%o67) 2*sqrt(h)
>
> (%i68) subst(h=0.3,%);
> (%o68) 2*sqrt(0.3)
>
> (%i69) rembox(%);
> (%o69) 1.095445115010332
>
> To read the documentation for box, input ? box. There might be limitations
> on
> this method that I have not thought about.It might be possible to extend
> rembox
> to remove boxes bottom up one layer at a time.
>
> --Barton
>
> maxima-bounces at math.utexas.edu wrote on 01/23/2012 01:27:03 PM:
>
> > From: Ralf Jung <ulumbelu at googlemail.com>
> > To: Maxima at math.utexas.edu
> > Date: 01/23/2012 01:26 PM
> > Subject: How to prevent the immediaetly evaluation after
> > substitute a variable
> > Sent by: maxima-bounces at math.utexas.edu
> >
> > Dear maxima list members,
> >
> > here a example what's happend
> >
> > (%i1) x : 2*sqrt(h)
> >
> > (%o1) 2sqrt(h)
> >
> > (%i2) subst([h=0.3], x)
> >
> > (%o2) 1.095445115010332
> >
> > But I want this outcome
> >
> > (%o2) 2sqrt(0.3)
> >
> > is it possible to stop the immediaetly evaluation after subst, so I
> > can see first my expression with all the variables changed?
> >
> > ralf
> > _______________________________________________
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> > Maxima at math.utexas.edu
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>
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