Normalized data to lookup table

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Amit Ifrach
Amit Ifrach am 11 Feb. 2023
Beantwortet: Walter Roberson am 11 Feb. 2023
I got a normalized vector which I want to make as an index for lookup table (preferablt in heatmap colors or blue colors).
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dpb am 11 Feb. 2023
Well, you're going to have to gives us more background than us an example of what you're trying to get from what it is you might find <rescale> of interest, though.

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Walter Roberson
Walter Roberson am 11 Feb. 2023
There are a number of circumstances in which you can just use the normalized values as the data, and use a colormap(), and the value will automatically be converted into a color table index. See clim (caxis in older releases)
However if you need to do the mapping manually:
NumberOfEntriesInTable = size(YourColorTable,1);
mindata = min(YourData);
maxdata = max(YourData);
proportion = (YourData - mindata)./(maxdata - mindata);
table_idx = ceil(proportion * NumberOfEntriesInTable * (1-eps));
colored_data = YourColorTable(table_idx,:);
The output, colored_data,will be a numel(YourData) by 3 array, with Red, Green, and Blue columns.


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