bugGNU Octave - Bugs: bug #59685, sinpi, cospi, sind, cosd small...


bug #59685: sinpi, cospi, sind, cosd small errors

Submitter:  Rik <rik5>
Submitted:  Mon 14 Dec 2020 10:27:32 PM UTC
Category:  Octave Function Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Inaccurate Result
Status:  None Assigned to:  None
Originator Name:  Open/Closed:  * Open
Release:  * dev Operating System:  * Any
Fixed Release:  None Planned Release:  None
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Mon 14 Dec 2020 10:27:32 PM UTC, original submission:  

The functions named in this bug report are in active development on the development branch.  I wanted to post a bug report that could be used to track any problems.

For example, the BIST tests were incomplete so recent changes to make the algorithm more accurate also caused the functions to lose the ability to process complex inputs.  Oops.  That capability has been restored, but the function is still not as accurate as its Matlab equivalent.

For example, cos(x) is an even function so cos (x) == cos (-x).  However, this is not true for certain values in Octave.  For example,

cosd (67) - cosd(-67)
ans = 5.5511e-17

Matlab gets this right with an error or 0.

Rik <rik5>
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