Re: Re: Modify machine precision

[Nicholas Jankowski]

Alberto: just so we're clear, could you provide a concise example of
the data you're working with and what you're trying to do with it?
Before we send you off to a Maxima or Mathematica solution, it would
be good to verify that the problem here isn't just definitions or
communication. :)

nickj

2012/3/29 Jordi Gutiérrez Hermoso <address@hidden>:
> 2012/3/29 alberto frigerio <address@hidden>:
>> So you are telling me that in Octave there is no way to force machine
>> precision in a program? My problem is that I'm doing some analyses with
>> another precision whose machine precision is 1e-13
>
> Listen to what you just said. Programs have different *machine*
> precision? The *machine* precision isn't determined by software, but
> it's a property of your hardware, of your *machine*. Your computer has
> an FPU, and this FPU has certain limitations:
>
>    http://en.wikipedia.org/wiki/Floating-point_unit
>
> If you need variable precision arithmetic, you can try to use vpa from
> the symbolic package, but depending on what you're doing, I would
> follow Martin Helm's recommendation and use a program other than
> Octave.
>
> HTH,
> - Jordi G. H.
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