Plots via s-function

2011 11 24
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Hello,
I've written a Level2 S-Function, that plots space vector diagramms during my Simulink simulations. This is working so far, but the problem is that the execution time of the s-function slows down my simulation due to the matlab interpreter.
So my question is, is there any way to create and modify matlab-figures with a mex S-Function? After a lot of searching, I could not find any commands for doing that.
Thank you for your help
Tobias Gemaßmer

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Titus Edelhofer
Titus Edelhofer 2011-11-24

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Hi Tobias,
hmm, then there is indeed not much more that can be done ... writing the S-function in C will not make much of a difference in this case I guess. You might profile your S-function (just call
profile on
before running the simulation and
profile report
afterwards. The report should show up the time spent in your S-Function. I don't expect much interesting there, but just to be sure ...
Titus

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Titus Edelhofer
Titus Edelhofer 2011-11-24

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Hi Tobias,
not really. What I would suggest is to reduce the sample time of the output so that the S-function (plotting) is not done every time step but e.g. every 10th step only ...
Second: how does the plotting work, do you redraw the entire plot every time step (plot(x,y)), or (preferably) do you store the handle of the plot in some work vector and do only update the line, something like
set(h, 'xdata', newXData, 'ydata', newYData);
This is usually significantly faster.
Titus
Tobias Gemaßmer
Tobias Gemaßmer 2011-11-24

0 个投票

Hi Titus
thank you for your answer.
Since the plot is a space-vector-diagram, it consits of a couple of lines. I store the handle of every line in a work vector and update the x and y data. I already reduced the sample time of the S-function, which speeded up the simulation, but for me was kind of dissatisfactory.
Tobias Gemaßmer
Tobias Gemaßmer 2011-11-25

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Hi Titus,
By using the profiler, I recognized, that most of the calculation time is needed on some function according to the legend. So I was able to speed up the update function of my figure by having a static legend using
% Static legend
set(gca,'LegendColorbarListeners',[]);
setappdata(gca,'LegendColorbarManualSpace',1);
setappdata(gca,'LegendColorbarReclaimSpace',1);
(I found those commands on http://undocumentedmatlab.com/blog/plot-performance/)
So anyway, my function doesn't slow down the simulation any more. Thank you for your good advice
Tobias

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Titus Edelhofer
Titus Edelhofer 2011-11-25
Good to hear, so I guess the question might be seen as answered ...

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