Comparing vectors to matricies

[dirac]

Hi all, I apperciate this has been dealt with many a time before...But I have
one vector I would like to compare to another row of a matrix. Basically I
have

a = vector of length ~300
b = matrix of length ~10000

The vectors and matricies are in asceding order so idealy I want to look at
a(1) and find the index of b that closest matches it. And then a(2) etc. The
ultimate goal is to match the avlues of a to the corresponding values from
the second column in b.

Any help will be really apreciated, even if it is functions to look at.

Thanks
Martin

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Pretty much convinced Octave>Excel for scientific data analysis!
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