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Preallocation of a matrix: how to shrink it afterwards?

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I'm trying to create an empty epoch for every epoch number in epochn - epochn is a nx1 matrix. How can I preallocate fullstate efficiently? Thanks!
%Create empty epoch for every epoch number
for t = epochn
idx = find(epochn == t);
fullstate(t) = state(idx);
clear idx
end

Answers (1)

per isakson
per isakson on 11 May 2020
Edited: per isakson on 11 May 2020
Something like this
fullstate = class_of_state( size(epochn) );
for t = reshape( epochn, 1,[] )
idx = find(epochn == t);
fullstate(t) = state(idx);
clear idx
end
The variable, state, what type of values does it have?
"shrink it afterwards" why would that be necessary?

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