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Re: Plotting issue, Windows, Octave 4.0, very basic plots


From: Mike Miller
Subject: Re: Plotting issue, Windows, Octave 4.0, very basic plots
Date: Tue, 1 Sep 2015 10:27:44 -0400
User-agent: Mutt/1.5.23 (2014-03-12)

On Tue, Sep 01, 2015 at 06:28:53 -0700, JokerOne wrote:
> but I am still not sure, if this is really the effect. I read anywhere, that
> the fltk toolkit fails at number as large as 1e38 (10e-38), but not at
> numbers in the order of 1e6?

This is also true, because the upper bound of single-precision floating
point is around 1e38.

But Panxto's explanation is also correct, the precision of
single-precision is less than the 12 significant digits that your
example tries to use.

  octave:1> flintmax ("single")
  ans =  16777216

This is the maximum integer value that can be represented exactly in a
single-precision value. That's about 7 significant digits (discounting
the leading 1).

HTH,

-- 
mike



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