how to save a plot ?

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Hassan
Hassan 2011-6-19
I have two large data sets. Usually it takes a lot of time to save a plot on hard drive. I wonder how I can save a plot as jpeg file in a quick way. Usually it takes a lot of time to save a plot on hard drive. I apperciate your help.
saveas(gcf,'C:\plot.jpg')
delete(gcf)
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Walter Roberson
Walter Roberson 2011-6-19
save() is the counterpart of load()
http://www.mathworks.com/help/techdoc/ref/save.html
It stores the data instead of the image, so whether it is useful to you depends on what you need to do afterwards.
Hassan
Hassan 2011-6-20
I see, it's not the one I need then.

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回答(2 个)

Jan
Jan 2011-6-19
I guess that it is not the saving, but the drawing of the plot, which consumes the most time. "delete(gcf)" means, that you create a new figure for each plot. This is much slower than using the same figure and only update the axes object, or even better: Keep the axes also and update just the children.
So please insert a DRAWNOW before the method for sving and use the PROFILEr to find the most time consuming lines.
  6 个评论
Walter Roberson
Walter Roberson 2011-6-19
So effectively the bulk of the time is being used in the built-in function toolbox/matlab/graphics/hardcopy which is being called by the plot renderer.
Hassan
Hassan 2011-6-20
it take longer than it shows on profiler. I tried that and when I dont save the plot, it's much faster (although not quite fast).

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Walter Roberson
Walter Roberson 2011-6-19
There is a possibility that Oliver's export_fig might be faster; it's worth a try.
  3 个评论
Walter Roberson
Walter Roberson 2011-6-19
Hmm... what kind of scene elements do you use? If you do not have transparency, then _possibly_ changing the renderer property of the figure or the drawmode property of axes could help. Unfortunately I do not know how rendering is done for saving images, so these things might not make any difference.
Hassan
Hassan 2011-6-19
sorry Walter, I didnt understand the meaning of scene elements, transprancy and renderer. but will have a look at them.

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