[Octave-bug-tracker] [bug #59615] feature request for sinpi, cospi, yyaxis functions

[Nicholas Jankowski]

Follow-up Comment #5, bug #59615 (project octave):

from a compatibility standpoint:

matlab apparently introduced some of these in v2018b:

sinpi
https://www.mathworks.com/help/matlab/ref/double.sinpi.html


Y = sinpi(X) computes sin(X*pi) without explicitly computing X*pi. This
calculation is more accurate than sin(X*pi) because the floating-point value
of pi is an approximation of π. In particular:

For integers, sinpi(n) is exactly zero.

For odd integers, sinpi(n/2) is +1 or -1.


similarly cospi
https://www.mathworks.com/help/matlab/ref/double.cospi.html

since it was mentioned in the title, yyaxis was added in 2016 and has some
similarity to plotyy: 
https://www.mathworks.com/help/matlab/ref/yyaxis.html

according to the help "yyaxis function creates one Axes object with two
y-axes. plotyy creates two overlaid Axes objects that can get out of sync. You
can use yyaxis with any 2-D plotting function. plotyy is limited to working
with plotting functions of the form function(x,y). It does not work with other
plotting functions, such as errorbar."

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