[Octave-bug-tracker] [bug #57279] Slow plotting of multiple lines

[Pantxo Diribarne]

Update of bug #57279 (project octave):

                  Status:                    None => Confirmed              
                 Release:                   4.4.1 => dev                    

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Follow-up Comment #2:

I used the following simple code for testing. 


figure (99, "visible", "off"); clf; 
for ii = 1:20
  tic; arrayfun (@() __go_line__ (gca (),"xdata", [0, 1], "ydata", [0, 1]),
1:100); tt(ii) = toc
endfor
plot (tt);
xlabel "Number of calls"
ylabel "time for 100 lines (s)"
print timings.png


On my linux mint 19.2 box, Octave 4.2 is incredibly much faster at creating
line objects than Octave 6.0: ~12ms for 100 lines against ~320ms. More
important, the number of objects already present in the axes does not
significantly affect the timing in 4.2 while it does in Octave 6.0. See the
attached two files


(file #47908, file #47909)
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Additional Item Attachment:

File name: timings_4.2.png                Size:22 KB
    <https://savannah.gnu.org/file/timings_4.2.png?file_id=47908>

File name: timings_6.0.png                Size:25 KB
    <https://savannah.gnu.org/file/timings_6.0.png?file_id=47909>



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