Is it possible to do this without for cycle?

T = zeros(M,K);
for k = 1:K
    T(Y==k,k) = 1;
end

[Birdman]

Share your entire code.

Answer 1

[Jos (10584)]

% data
Y = [1 1 3 2 3 1 1 2]  % M = numel(Y)
K = 3
% engine
T = double((Y(:) - (1:K))==0)

[Mr M.]

beautiful, thanks

[Walter Roberson]

The above code requires R2016b or later. Earlier versions would need to use bsxfun()

Answer 2

[Walter Roberson]

https://www.mathworks.com/help/nnet/ref/ind2vec.html ind2vec()