How to calculate the distance between one row vector and a matrix??...

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sani ars 2012-12-14

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I need to calculate the distance between a one row vector a and a matrix i.e.

 test_point = [ 1.2 0.6 3.1 1.3]
 train_data = [7.7 2.8 6.7 2.3;
               5.2 2.5 3.0 1.1;
               2.0 6.5 8.6 9.8; 
               1.3 2.4 5.2 3.6;
               4 3 5 4 2 6 7 6]

I have to find the distance of test_point with every row of train_data.... how can I do that??.. I have tried the MATLAB functions pdist2() and dist() and many other etc but they required two matrices of the same dimension...

plzz tell how to write the function to calculate the distance??...

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回答（2 个）

Andrei Bobrov 2012-12-14

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编辑：Andrei Bobrov 2012-12-14

在 MATLAB Online 中打开

[edit]

a = bsxfun(@minus,train_data,test_point);
out = cellfun(@norm,num2cell(a,2));

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sani ars 2012-12-14

What about "Euclidean distance" if I want to use it??... pdist2() is giving me the choices to use any distance calculation mathod i.e "Euclidean distance" ... but with your provided function bsxfun() I couldn't do this...

Sorry I didn't mention about it before... But I need to calculate the distances by using "Euclidean distance" in my function

sani ars 2012-12-14

thanxx alot Teja Muppirala..... this line is working fine..

out = pdist2(train_data,test_point)....

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Walter Roberson 2012-12-14

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Have you considered a "for" loop ?

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sani ars 2012-12-14

No..... In haven't used "for" loop yet...

Do you mean that I should take each row of train_data one by one against test_point??... If yes then, in that case, should I use the function pdist2()??....