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Set unique elements to 0s and 1s matlab

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chiefjia on 10 May 2021
Answered: the cyclist on 10 May 2021
Dear MATLAB experts,
I'm working on a table which contains 3 variables, with only 2 unique elements per variable. I'm trying to rename the elements of the variables to 0s and 1s, setting one unique element to 0 and the other to 1. So far I have managed to set each column to dummy variables with the code below, but this is not what I'm looking for, since I just need one column per variable.
categorical_index = 1;
variables_table = table.Properties.VariableNames;
for i=1:width(le)
le.(variables_table{i}) = dummyvar(categorical(table.(categorical_index)));
categorical_index = categorical_index + 1;
I would really appreciate your help.
Thank you in advance

Accepted Answer

the cyclist
the cyclist on 10 May 2021
Here is one way. I doubt it is the best.
% Original table with two variables
x = {'a','b','a','a','b'}.';
y = {'c','c','c','d','d'}.';
tbl = table(x,y)
tbl = 5×2 table
x y _____ _____ {'a'} {'c'} {'b'} {'c'} {'a'} {'c'} {'a'} {'d'} {'b'} {'d'}
% Convert to numeric array of unique values
tbl_01 = [findgroups(tbl.x)-1, findgroups(tbl.y)-1]
tbl_01 = 5×2
0 0 1 0 0 0 0 1 1 1

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