How do I assign a range of values in an array to specific colors?

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GS
GS 2016-4-16
回答： Walter Roberson 2016-4-16
I have extracted a 2-D matrix from a RGB 3-D matrix. The values in this 2-D matrix range from 0 - 10,000. I would like for certain ranges to display certain colors, for example i'd like for values from 0 to 100 to be displayed as purple and values from 101-200 to be displayed as pink. Is their a way I can assign different ranges to different colors?

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Walter Roberson
Walter Roberson 2016-4-16
Create a colormap with 10001 entries in it. In entries 1 to 101, write the RGB for purple. In entries 102 to 201, write the codes for pink.
image() your data. colormap() your created colormap. caxis([0 10000]) Now each value will map to colormap index 1 + floor(value)

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