MATLAB: Comma separated list generation

Question

How can you expand a comma separated list from a repetition? I am searching for the elegant way to do something like this:

Instead of

Y = blkdiag(X, X, X),

write Y = repblkdiag(X,3). The code I use now is:

function Y = repblkdiag(X, n)
Y = [];
for j = 1:n
    Y = blkdiag(Y, X);
end

I expected that something like

Y = blkdiag(deal(repmat(X,3)))

would work. Thanks for your interest and contribution,

Jan

Answer 1

xc = repmat({X},1,3)
Y = blkdiag(xc{:})