How to ignore some elements of function returned vector?

Question

NMTri 2014-1-8

回答： David Sanchez 2014-1-8

When writing my code, I need some elements from the returned vector. For example:

 y=zeros(100,1003);
for ii=1:100
 y(ii,:)=conv(h(ii,:),x(ii,:));
end

I just want y(:,4:end); and I my solution is:

y(:,1:3)=[];

I think that matlab should have an elegant expression for this case. Is there any suggestion. Something like:

 y=zeros(100,1000);
for ii=1:100
y(ii,:)=conv(h(ii,:),x(ii,:))(4:1003); %of course it's not correct :(
end

Thanks in advance :)

Answer 1

David Sanchez 2014-1-8

I am sure that knowing what is h and x would give some other ideas, but, Why don't you just do this?:

y = zeros(100,1000);
for ii=1:100
  tmp = conv(h(ii,:),x(ii,:));
  y(ii,:) = tmp(4:end);
end