Re: Converting code from Scilab to Octave and strange slow down while trying to plotting.

[Mike Miller]

On Wed, Feb 20, 2019 at 13:42:16 -0500, RT wrote:
> I'm trying to convert some code over from Scilab 6.01 to Octave 5.0.91.
> I'm testing the code with Octave version 5.0.91 on Ubuntu 64bit 16gig ram.
> In Scilab the code plots in about 2 seconds but after 15mins in Octave
> 5.0.91 it's still going.  Can anyone see the error in my conversion from
> Scilab to Octave and why this won't plot with the same values as Scilab?

There is no error, you've found a performance regression in Octave 5.
Can you file a bug report?

Here is a simpler example that shows a loss of performance from 4.4 to
5, with scatter3 on 1024 points:

    $ cat t.m
    [x, y, z] = peaks (32);
    [x, y, z] = deal (x(:), y(:), z(:));
    tic;
    scatter3 (x, y, z);
    toc
    $ octave-4.4.1 t.m
    Elapsed time is 0.104946 seconds.
    $ octave-5.0.91 t.m
    Elapsed time is 20.1961 seconds.

-- 
mike

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