How to lookup an item by multiple indexes in matlab

Question

I have a n+1 column matrix. I want a function mySearch(idx1,idx2...,idxn) that returns the n+1'th column in the row whose first n elements are equal to idx1...idxn

Next step, i want mySearch to return a value which is closest to the indexes, by some simple interpolation.

Is there an easy way to do this?

Thanks

Answer 1

Use norm to determine the distance and min to get the closest value:

function v=mySearch( idx, M )
n=length(idx);
d=[]
for row = M'
   d=[d; norm(row(1:n)-idx) ]
end 
[~, I]=min(d);
v = M(I,n+1);
end function

Above idx is a vector of [idx1, idx2, ..., idxn].