How to turn x,y,counts data into a surface map

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Samuel White 2018-9-5

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https://ww2.mathworks.cn/matlabcentral/answers/417675-how-to-turn-x-y-counts-data-into-a-surface-map

评论： Star Strider 2018-9-5

Hi all, I have a text file in format x,y,count format, as in an x position, y position and a count number. I wish to make a colourmap plot of the data such that it shows regions of high counts and low counts by colour. The surf function would be ideal, only my data is not in a counts matrix. How can I form the colourmap plot?

Kind regards, Sam

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Answer 1

Star Strider 2018-9-5

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Plot your data using the stem3 (link) function. You can easily see if your data are gridded, since the intervals between the stem lines will be regular. If so, use the reshape (link) function to create the matrices to use with surf.

If instead your data are scattered, you will likely need to use the griddata (link) or related interpolation functions to create the necessary matrices.