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[Octave-bug-tracker] [bug #47738] expint is inaccurate for certain imagi
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From: |
Michele Ginesi |
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Subject: |
[Octave-bug-tracker] [bug #47738] expint is inaccurate for certain imaginary inputs |
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Date: |
Wed, 23 Nov 2016 08:32:41 +0000 (UTC) |
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User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:50.0) Gecko/20100101 Firefox/50.0 |
Follow-up Comment #8, bug #47738 (project octave):
Dear all,
I also made some experiment with this function. In file #39051 I used three
strategies to evaluate expint: series expansion, asymptotic series expansion
and continued fraction. The file #39052 show which strategy make the less
error (exact values were computed with the octave symbolic package) in the
complex square [-100,100]x[-100,100].
Then I wrote a function (file #39053) which divides the input and uses a
different strategy depending on where the input is in the complex plane. In
file #39054 there is a comparison between myexpint.m and the Matlab expint.
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