# [Maxima] eliminating '1.0' when divided by float numbers

Stavros Macrakis macrakis at alum.mit.edu
Wed May 2 20:29:23 CDT 2012

```In Maxima, floating-point numbers represent approximate quantities.  The
formula 1.0*x is different from just x, which is an exact number.  If you
want to convert all approximate numbers to a nearby round number, you could
do something like

floats_to_rats(expr) :=
block([ratprint:false],
scanmap(lambda([q],if floatnump(q) then rat(q) else q),expr))\$

see ? ratepsilon to control the tolerance.  You could also do rat(expr),
but that will change the form of the expression in general.

-s

On Wed, May 2, 2012 at 9:19 PM, ishi soichi <soichi777 at gmail.com> wrote:

> Maxima 5.25
>
> Hi. say I have an equation like
>
> 3 = 3.5 %e^( ...);
>
> then, I want to eliminate '3.5', so I divide the whole thing by 3.5.
>
> %/3.5;
>
> it gives,
>
> ... = 1.0 %e^(...)
>
>
> '1.0' remains there.  Of course there is no influence in terms of math,
> but it matters if I want to take log of it,
>
> log(%);
>
> gives,
>
> ... = log(1.0 %e^(...))
>
> Is there anyway to eliminate '1.0' so that it becomes easier to compute it?
>
>
> soichi
>
>
>
>
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>
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