Vector inside another vector

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José Campelo
José Campelo 2019-5-21
评论： madhan ravi 2019-5-21
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
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Alex Mcaulley
Alex Mcaulley 2019-5-21
Your problem is not difficult. You just need to take a look to logical indexing in Matlab. For example:
logical indexing
matrix indexing
José Campelo
José Campelo 2019-5-21
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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采纳的回答

Adam Danz
Adam Danz 2019-5-21
S =(0:30)';
k = 15;
U = S .* (S>=k);

更多回答（1 个）

madhan ravi
madhan ravi 2019-5-21
编辑：madhan ravi 2019-5-21
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 个评论
Adam Danz
Adam Danz 2019-5-21
My homework detectors didn't go off on this one.
madhan ravi
madhan ravi 2019-5-21
XD sometimes it doesn’t even in mine, maybe a bug xd.

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