Plotting very slow and took long time to launch plot tool

Question

Melissa Chen 2018-6-20

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https://ww2.mathworks.cn/matlabcentral/answers/406627-plotting-very-slow-and-took-long-time-to-launch-plot-tool

回答： Greg 2018-6-21

I am plotting 50 graphs in the same plot with these few lines. The data are already in the workspace.

figure; hold on

for n = 1:50

plot(x, y,'LineWidth',2.0);

hold on

end

The figure window shows up within 5 seconds, but it takes MATLAB 3 minutes to populate the graph window with the graphs. Additionally, when I try to use the plot tools to modify the figure, each icon I click or each action I did takes ~ 10 seconds to act, including some simple action like moving the legend position or click to select a specific graph. My computer practically froze while waiting.

I have a pretty fast computer - an i7 8th generation with 16 GB RAM. I am running on MATLAB R2017b. Running other high memory usage program doesn't have this issue. I have never had this problem with R2017b on another supposedly slower computer - i3 with 32 GB RAM.

I am more of trying to trouble-shoot if this is the problem of the computer or with MATLAB. If anyone had similar problem with R2017b hopefully the answer I got would be helpful. Thanks MATLAB community!

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Greg 2018-6-21

Also, you've already called hold on before the loop, doing it again inside is silly.

Melissa Chen 2018-6-21

Thanks Greg. my x is a [1x1801] and my y is a [50 x 1801]. I did thought 50 maybe too much so I went back and try to plot 10 instead. The amount of time it takes to show up is similar to plot with 50 which is something I never seen before with my old computer. But you made a good point of the CPU activity and maybe there's something that's feeding off CPU when I am plotting with matlab.

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