Re: [Maxima-discuss] Maxima (lisp on Mac) - heap exhausted

[Richard F. <fa...@be...>]

On 4/23/2014 12:09 PM, Scott Hughes wrote:
>
> An example...
>
> a:  50000000;
>
> b:  60000000;
>
> c:   40000000;
>
> round ((6^a-2^b-3^b)/(6^(a-7)-4^b-5^b));
>

The result of the calculation, before rounding, is appx
-1.815603675821045b-3030638

this is easily computed using 2.0b0  etc instead of 2 etc.

That is, it has over 3 million digits .

Before computing and displaying them, it may make sense
to ask.... what do you plan to do with them?


> *From:*Gunter Königsmann [mailto:gu...@pe...]
> *Sent:* April-23-14 2:58 PM
> *To:* fa...@be...; Scott Hughes; 
> <max...@li...>
> *Subject:* Re: [Maxima-discuss] Maxima (lisp on Mac) - heap exhausted
>
> Another question:
> How do you calculate the powers? I get a different error message, if I 
> Try.
>
> On 23. April 2014 20:11:26 MESZ, Richard Fateman <fa...@be... 
> <mailto:fa...@be...>> wrote:
>
> what do you plan to do with a number raised to the  power 60,000,000?
>
> If you are computing it in order to then reduce it modulo some other 
> number,
> then there is a better way to do it.
>
>
>
> On 4/23/2014 6:34 AM, Scott Hughes wrote:
>
>     Firstly, I’m not a programmer and only recently started to use
>     Maxima (command line). I don’t know anything about lisp. I’m
>     running Maxima on a Mac but also on a PC through Windows. Both are
>     the command line version.
>
>     I only need to use Maxima for a few basic operations, primarily
>     small numbers raised to large (at least 8) exponents. Aside from
>     that, I’m using the round and asksign commands.
>
>     I’m encountering “heap exhausted” errors once my exponents get
>     beyond about 60 000 000 and have looked in manual and forums for
>     help. There is reference to changing heap size but I didn’t
>     understand the command or even how to enter it. Can anyone help me
>     with very explicit instructions ?  I’m not concerned with the
>     length of time the calculations take, just don’t want them to
>     crash before they complete.
>
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