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List:       scilab-users
Subject:    Re: [Scilab-users] {EXT}  Problems arising from truncation of %pi
From:       "Dang Ngoc Chan, Christophe" <Christophe.Dang () sidel ! com>
Date:       2021-01-06 7:46:08
Message-ID: DB8PR07MB6315197AC64E9F2D71F6CDF3E5D00 () DB8PR07MB6315 ! eurprd07 ! prod ! outlook ! com
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Hello Federico,

I'm not sure to understand exactly your needs but:

> De : Federico Miyara
> Envoyé : mardi 5 janvier 2021 09:20
> 
> --> sin(%pi)
> ans  =
> 0.0000000000000001224647

seems to be something we cannot get rid off unless using symbolic calculation i.e. \
having a specific variable for pi which is recognised and gives the exact result with \
given functions.

> 1) How is the sin() function extended to very large values of the argument?

I don't know about Scilab but as it is initially based on Fortran, it probably uses \
the related Fortran library (or maybe a more modern library, this is not documented). \
You might have some answers here:

https://en.wikipedia.org/wiki/Sine#Software_implementations

Hope this helps,

Regards

--
Christophe Dang Ngoc Chan
Mechanical calculation engineer


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