How can I assign a number to a letter combination in matlab?

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Jonathan Schipper 2021-9-23

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回答： Voss 2021-12-18

采纳的回答： Voss

Hi!

I have trouble assigning a number to a letter combination in a table in Matlab, for instance x=0, f=10, s=1.

the table looks something like this

x x f s

x f x s

x fs x ss

I want this to convert to a table like this:

0 0 10 1

0 10 x 1

0 11 0 2

Can someone help me with this problem?

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Image Analyst 2021-9-23

There are many ways that could be a table, like a 1x1 table, a 1x4 table, a 4x1 table, etc. So please attach your actual table in a .mat file or give code to contruct it from those letters.

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Answer 1

Voss 2021-12-18

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Let's say the initial table was a 2-D cell array of chars called t and you want to convert it to a matrix of doubles called y.

t = { ...
    'x' 'x' 'f' 's'; ...
    'x' 'f' 'x' 's'; ...
    'x' 'fs' 'x' 'ss'};
display(t);
lookup = { ...
    'x' 0; ...
    's' 1; ...
    'f' 10};
y = zeros(size(x));
for i = 1:size(lookup,1)
    y = y+lookup{i,2}*cellfun(@(x)nnz(x==lookup{i,1}),t);
end
display(y);