how to save a plot ?

Question

Hassan 2011-6-19

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https://ww2.mathworks.cn/matlabcentral/answers/9834-how-to-save-a-plot

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 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 2011-6-20

I see, it's not the one I need then.

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Answer 1

Jan 2011-6-19

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https://ww2.mathworks.cn/matlabcentral/answers/9834-how-to-save-a-plot#answer_13520

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.

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Hassan 2011-6-19

actxserver 4 1.047 s 1.047 s

graphics\private\prepare 1 0.828 s 0.765 s

graphics\private\restorehg 1 0.719 s 0.687 s

graphics\private\restore 1 0.719 s 0.000 s

specgraph.scattergroup.refresh 2 0.500 s 0.500 s

...ph.scattergroup.schema>LdoDirtyAction 3 0.500 s 0.000 s

workspacefunc 8 0.108 s -0.000 s

workspacefunc>getStatObjectsJ 4 0.077 s 0.030 s

graphics\private\preparehg 1 0.063 s 0.000 s

scatter 1 0.047 s 0.016 s

graphics\private\fireprintbehavior 2 0.047 s 0.015 s

workspacefunc>getStatObjectJ 256 0.047 s -0.000 s

xlswrite>activate_sheet 4 0.046 s 0.046 s

hggetbehavior 364 0.032 s 0.032 s

workspacefunc>createComplexScalar 252 0.032 s 0.016 s

workspacefunc>num2complex 362 0.032 s 0.000 s

lsline 1 0.031 s 0.016 s

fileparts 12 0.031 s 0.031 s

workspacefunc>getShortValueObjectsJ 2 0.031 s 0.015 s

workspacefunc>getStatObjectM 256 0.031 s 0.000 s

workspacefunc>local_max 94 0.031 s 0.031 s

num2str 18 0.016 s 0.016 s

graphics\private\name 1 0.016 s 0.000 s

spa_sf 1 0.016 s 0.016 s

xlabel 4 0.016 s 0.016 s

findall 14 0.016 s 0.016 s

specgraph.scattergroup.scattergroup 1 0.016 s 0.016 s

kurtosis 2 0.016 s 0.016 s

graphics\private\restoreui 1 0.016 s 0.016 s

graphics\private\inputcheck 1 0.016 s 0.000 s

cell.strmatch 2 0.016 s 0.000 s

strmatch 2 0.016 s 0.016 s

gra...rivate\inputcheck>LocalCheckDevice 1 0.016 s 0.000 s

savtoner

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 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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Answer 2

Walter Roberson 2011-6-19

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https://ww2.mathworks.cn/matlabcentral/answers/9834-how-to-save-a-plot#answer_13510

There is a possibility that Oliver's export_fig might be faster; it's worth a try.

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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 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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how to save a plot ?

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