Compare column vector to matrix

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Simon 2016-8-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/298587-compare-column-vector-to-matrix

评论： Simon 2016-8-5

采纳的回答： Azzi Abdelmalek

在 MATLAB Online 中打开

Hello,

I'm trying to find the first element and its index into a 73X615 matrix, where each value should be less or equal to a value in 73X1 column vector. So let's say that the matrix is

B = -5 + (5+1)*rand(73,615);

and the vector is

A = -5 + (5+1)*rand(73,1)

My intention is to extract a columns vectors [C, iC], where each value of C is the first value in B that is less or equal than the value in A at the corresponding row, and iC is the index of that value.

My apologies if the question seems a bit contrived, but I'm new to Matlab and I didn't know how to formulate it more clearly.

I hope you can help me with this issue, before hand, many thanks.

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采纳的回答

Azzi Abdelmalek 2016-8-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/298587-compare-column-vector-to-matrix#answer_230908

编辑：Azzi Abdelmalek 2016-8-5

在 MATLAB Online 中打开

B = -5 + (5+1)*rand(73,615)
A = -5 + (5+1)*rand(73,1)
id=bsxfun(@le,B,A)
for k=1:size(id,1)
  ii=find(id(k,:),1)
  out(k,1:2)=[B(k,ii) ii]
end

Incase there are empty indices

B = -5 + (5+1)*rand(73,615)
A = -5 + (5+1)*rand(73,1)
id=bsxfun(@le,B,A)
kk=0
for k=1:size(id,1)
  ii=find(id(k,:),1)
  if ~isempty(ii)
      kk=kk+1
      out(kk,1:2)=[B(k,ii) ii]
  end
end
out

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Azzi Abdelmalek 2016-8-5

Simon, this is not how it works in this forum, when an answer satisfies your need, you have to mark the answer as accepted. You can also ask for some explanations related to your question, if it's not you have to post another question.

Simon 2016-8-5