Vector inside another vector

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José Campelo
José Campelo on 21 May 2019
Commented: madhan ravi on 21 May 2019
Hi! I have a vector S = [0 1 2 3 4 ... 30]' and now i want to create another vector U that is equal to 0 if K<S and equal to S if K>=S. In my exercise K=15.
I did this:
U1=zeros(30,1);
U1(15,30)=S;
Can you please help me? Thanks
  3 Comments
Alex Mcaulley
Alex Mcaulley on 21 May 2019
Your problem is not difficult. You just need to take a look to logical indexing in Matlab. For example:
José Campelo
José Campelo on 21 May 2019
Correct. Basically what I want is that U be a column with 0 until the 14th position and then 15, 16, 17 etc until 30.

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Accepted Answer

Adam Danz
Adam Danz on 21 May 2019
S =(0:30)';
k = 15;
U = S .* (S>=k);

More Answers (1)

madhan ravi
madhan ravi on 21 May 2019
Edited: madhan ravi on 21 May 2019
People don’t do homeworks here. Index K>=S to U1 lhs and S rhs by equating against each other. Since it’s your homework see Alex’s links above and experiment.
  2 Comments
Adam Danz
Adam Danz on 21 May 2019
My homework detectors didn't go off on this one.
madhan ravi
madhan ravi on 21 May 2019
XD sometimes it doesn’t even in mine, maybe a bug xd.

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