How to assign specific value for character
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I have a cell array of character vectors, let say
A = {'r' 'b' 'g'; 'g' 'r' 'b'; 'b' 'r' 'g'}
how do I change this character to a specific value, eg: r = 0.5, b = 2, g = -3?
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Answers (2)
Jos (10584)
on 21 May 2017
Here is an easy way:
A = {'r' 'b' 'g'; 'g' 'r' 'b'; 'b' 'r' 'g'}
RGBval = [0.5 2 -3]
[~,loc] = ismember(A,{'r','g','b'})
B = RGBval(loc)
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Walter Roberson
on 21 May 2017
RGBval('rgb') = [0.5 2 -3];
A = {'r' 'b' 'g'; 'g' 'r' 'b'; 'b' 'r' 'g'};
B = cellfun(@(C) RGBval(C), A);
2 Comments
Walter Roberson
on 22 May 2017
RGBval('rgb') is the same as RGBval(['r', 'g', 'b']) which is the same as RGBval([double('r'), double('g'), double('b')] which is the same as RGBval([114, 103, 98]). Characters, except for char(0), can be used as indices for arrays, and a vector of characters is transformed using double() to become a vector of indices.
There is no requirement that you use the minimum-memory data structure for operations if you have enough available memory.
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