Normalized data to lookup table

לק"י

Hello!

I got a normalized vector which I want to make as an index for lookup table (preferablt in heatmap colors or blue colors).

Thanks!

[dpb]

Well, you're going to have to gives us more background than that...show us an example of what you're trying to get from what it is you have...you might find <rescale> of interest, though.

Answer 1

[Walter Roberson]

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.