MATLAB: Replacing numbers with text – Math Solves Everything

Hello everyone,

I want to replace text with numbers. 1=s, 3=r, 4=b . I tried 2 methods. Cant figure why niether of the codes wont work . What am I doing wrong?

% Method 1 / not working returns "Index exceeds the number of array elements (3)." error 
mymat= [ 4     4     4
         3     4     4
         1     4     4
         4     3     4
         3     3     3
         1     3     4
         4     1     4]
t = string(["b", "r", "s"])
comMat = t(mymat)
%Method 2 / returns a NaN matrix and that's not what I want. 
mymat= [ 4     4     4
         3     4     4
         1     4     4
         4     3     4
         3     3     3
         1     3     4
         4     1     4]
mymat(mymat==4)= "b"
mymat(mymat==3)= "r"
mymat(mymat==1)= "s"
mymat

thank you for your time in advance.

mymat= [ 4 4 4 3 4 4 1 4 4 4 3 4 3 3 3 1 3 4 4 1 4]; t = ["s", "r", "b"]; v = unique(mymat(:)); % or maybe you want unique(mymat(:),'stable') B = string(categorical(mymat,v,t)) B = 7×3 string array "b" "b" "b" "r" "b" "b" "s" "b" "b" "b" "r" "b" "r" "r" "r" "s" "r" "b" "b" "s" "b"

mymat(mymat==4) = 10; mymat(mymat==1) = -42.5 mymat = 7×3 10.0000 10.0000 10.0000 3.0000 10.0000 10.0000 -42.5000 10.0000 10.0000 10.0000 3.0000 10.0000 3.0000 3.0000 3.0000 -42.5000 3.0000 10.0000 10.0000 -42.5000 10.0000 ● B = string(categorical(mymat, unique(mymat(:)), ["s", "r", "b"])) B = 7×3 string array "b" "b" "b" "r" "b" "b" "s" "b" "b" "b" "r" "b" "r" "r" "r" "s" "r" "b" "b" "s" "b"

B= discretize(mymat, [unique(mymat(:));inf], ["s", "r", "b"]) B = 7×3 string array "b" "b" "b" "r" "b" "b" "s" "b" "b" "b" "r" "b" "r" "r" "r" "s" "r" "b" "b" "s" "b"

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