Calculus with Matlab or octave

[friend]

Dear friends,

when we make some simple calculus with Octave or Matlab, how to have precise results in more than 4 decimal numbers.

example:2.9014567*8.9665531;#the result in Octave prompt is

ans=26.016

I would like to obtain a result with also six decimal figures and not three(016).

Thank you very much

---

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[Ben Abbott]

On May 9, 2008, at 7:39 PM, hassen62@... wrote:

> Dear friends,
>
> when we make some simple calculus with Octave or Matlab, how to have  
> precise results in more than 4 decimal numbers.
>
> example:2.9014567*8.9665531;#the result in Octave prompt is
>
> ans=26.016
>
> I would like to obtain a result with also six decimal figures and  
> not three(016).
>
> Thank you very much
>

Its not exactly "Calculus", but if you want more precision ...

        > x = 2.9014567*8.9665531;
        > num2str (x, "%16.12g")

Ben

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[Jordi Gutiérrez Hermoso-2]

On 09/05/2008, hassen62@... <hassen62@...> wrote:
> when we make some simple calculus with Octave or Matlab, how to have precise
> results in more than 4 decimal numbers.

Octave uses double precision floats for almost everything which is
about 16 decimal digits of precision. It just doesn't show all that
precision by default, even if it does use it for computations.

If you want to see it, just type "format long", which will make Octave
display it.

- Jordi G. H.
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[Sergei Steshenko-2]

--- Jordi Gutiérrez Hermoso <jordigh@...> wrote:

> On 09/05/2008, hassen62@... <hassen62@...> wrote:
> > when we make some simple calculus with Octave or Matlab, how to have precise
> > results in more than 4 decimal numbers.
>
> Octave uses double precision floats for almost everything which is
> about 16 decimal digits of precision. It just doesn't show all that
> precision by default, even if it does use it for computations.
>
> If you want to see it, just type "format long", which will make Octave
> display it.
>
> - Jordi G. H.
> _______________________________________________
> Help-octave mailing list
> Help-octave@...
> https://www.cae.wisc.edu/mailman/listinfo/help-octave
>

Try also

help output_precision

and use, say,

output_precision(18)
.

Regards,
  Sergei.


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