how can i write this statement labels=[1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;2;2;2;2;2;2;2;2;2;2;2;2;2;2;2;2;2;2;2;2;2;2;2;2;3;3;3;3;3;3;3;3;3;3;3;3;3;3;3;3;3;3;3;3;3;3;3;3;]; in compress form?
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how to write it in compact form avoiding repetition
Accepted Answer
Andrei Bobrov
on 25 Jun 2014
labels = kron((1:3)',ones(24,1));
or
labels = reshape(ones(24,1)*(1:3),[],1);
3 Comments
Sheema Khattak
on 25 Jun 2014
Andrei Bobrov
on 25 Jun 2014
Edited: Andrei Bobrov
on 25 Jun 2014
Sheema Khattak
on 25 Jun 2014
More Answers (2)
Roger Stafford
on 25 Jun 2014
n = 3;
r = 24;
labels = reshape(repmat((1:n),r,1),[],1);
4 Comments
Sheema Khattak
on 25 Jun 2014
Roger Stafford
on 25 Jun 2014
Why don't you just try it out? That is probably the best way to understand it. Do 1:n first. Then do repmat((1:n),r,1). Then do the 'reshape' of it.
Sheema Khattak
on 25 Jun 2014
PREMANAND
on 25 Jun 2014
Thanks.. Roger Stafford for that new information.
>> labelsKP=KronProd({ones(2400,1), (1:3).'});
you can get even more compression. For comparison,
>> labels = kron((1:3)',ones(2400,1));
>> whos labels labelsKP
Name Size Bytes Class Attributes
labels 7200x1 57600 double
labelsKP 7200x1 19660 KronProd
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