How do I compare two large matrices?

2014 9 13
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更新时间：2014 9 13
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Hi I'm new to matlab and was wondering how to compare two matrices
Basically I have one matrix that is 950x49 and one that is 950x1 I want to compare the two matrices to bring back the 10 closest values of each column of x that is compared with y, into a new matric 'new'. If anyone could please help, it would greatly be appreciated!

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José-Luis
José-Luis 2014-9-13
Should the values be in the same line?
Premal
Premal 2014-9-13
nope they just have to be the 10 closest values in each column!

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Rick Rosson
Rick Rosson 2014-9-13
编辑：Rick Rosson 2014-9-13

1 个投票

N = size(x,2);
u = ones(1,N);
d = abs(x - y*u);
v = sort(d);
z = v(1:10,:);

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Premal
Premal 2014-9-13
thank you so much!!! Is there anyway to get the value of x that was closest into z rather than the difference?

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Roger Stafford
Roger Stafford 2014-9-13

2 个投票

Just modify Rick's code a bit:
m = 10;
[~,p] = sort(abs(bsxfun(@minus,x,y)),2);
new = zeros(size(x,1),m);
for i = 1:N
new(i,:) = x(i,p(i,1:m));
end

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