[Octave-bug-tracker] [bug #47036] regressions in core m-files due to ismatrix changes

[Lachlan Andrew]

Follow-up Comment #10, bug #47036 (project octave):

Rik, you say that the plot routines are not time sensitive.  I disagree.

I have code that does roughly


a = rand (48, 365);
plot (a)


It takes 10s (!) in octave and 0.1s in Matlab.  In contrast,


plot (a')


is under 1s for both, so it must be something to do with the overhead per line
-- much of which is validation.  I've currently got it down to about 3s by
doing things like validating the type once, not for each line, and will post a
bug report/patch once the speed is acceptable.

In short: code in plot routines can be time sensitive.

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