Data reduction or resize function for imagesc plot

Question

Andreas Westlund 2022-3-30

0
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https://ww2.mathworks.cn/matlabcentral/answers/1684709-data-reduction-or-resize-function-for-imagesc-plot

回答： yanqi liu 2022-3-31

Hi,

I have data on a 2-dimensional grid where the number of points in the x-direction is much larger than what can be displayed. 10k data points and the plot window is at best around 1000 pixels wide.

I would like to change how matlab presents the data. Specifically I would like matlab to use the maximum z-value for all the data points represented by each pixel. So in the example above, i would like the first pixel to use the maximum Z-value of the first 10 data points.

I could do this in an ugly ad-hoc way, but I would like this to work also when I zoom or resize the plot. Is that possible somehow?

(I have found that I can use a custom method with imresize. If there is a way to change how a certain figure is resized when zoomed, that could be an option. I am not sure that is the right path though.)