Re: Help-octave Digest, Vol 87, Issue 32. Plotting performance with cywin running under Win7

[Matthew Reich]

Hello Marco,

Thank you for replying so quickly.
Octave plot renders even large vectors quickly enough for quick visualization, providing an important service.  Rendering the zoom shading is slow when it covers many points, only a minor inconvenience.

But, the main problem is that after the initial rendering, the next graphic operation, whether moving the figure or rendering another figure,  usually causes the plot window to become gray.  Moving the cursor over the figure changes the cursor coordinates, despite the lack of a displayed graph.  Getting the figure to redisplay requires some operation on the figure, such as autoscale, zoom, or grid toggle.  Doing this often causes another displayed figure to turn gray, particularly for large vectors.
Any suggestions?

Matthew Reich
home tel. 781-391-4913
cell tel. 617-710-3372

On 6/9/2013 7:37 PM, address@hidden wrote:

Subject:

Re: Plotting performance with cywin running under Win7

From:

marco atzeri <address@hidden>

Date:

Sun, 09 Jun 2013 21:32:13 +0200

To:

address@hidden

Il 6/9/2013 9:21 PM, Matthew Reich ha scritto:

Hello,

Running Octave through cygwin under Win 7 or under XP, graphics
performance for plotting suffers from slow GUI response speed. Following
the suggestions in Octave documentation, I am using fltk rather than
gnuplot, but the plotting speed and GUI response speed does not differ
much between the two.  In particular, using fltk, the initial rendering
is slow, especially for vectors over

several hundred thousand elements.

the problem is the size, you need to trim down the number of points.

For plots of all data sizes, the window becomes gray when moved, after
plotting another window, or intermittently after fltk GUI operations.
Convincing the window to redraw can take some time.  GUI response for
zooming is slow and sporadic.

Any suggestions for improving performance?
Also, any suggestions for which formats best export graphics for pasting
into MSWord documents?

jpg and png should be fine.

Thank you,

Regards
Marco