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Re: Numerical issues with sin()/cos()

From: Mike Miller
Subject: Re: Numerical issues with sin()/cos()
Date: Tue, 27 Mar 2018 12:00:54 -0700
User-agent: Mutt/1.9.4 (2018-02-28)

On Tue, Mar 27, 2018 at 11:29:54 -0700, Mike Miller wrote:
> It doesn't look to me like the errors are in the sin function.

In fact, I think what you want to look at are the differences between
the following v1 and v2

    N = 33; M = N/2; n = -M:M;
    v1 = sin (0.37 * pi * n) ./ (pi * n);
    v2 = sin (0.37 * pi * [n]) ./ (pi * [n]);

I think what is hurting your precision here is the lazy evaluation of
ranges in Octave.


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