MATLAB: Finding data points of two different matrices based off of time

assigning pointsdatatime

I have one matrix with data in the first column and time stamps in the second column (datamatrix.mat). The next matrix contains spiketimes (spiketimematrix.mat). I want to get the data point in the first column of first matrix that is the closest time point corresponding to the spike times in spiketimematrix.mat. For example, the first spiketime is 166.1670, which corresponds to the closet time point of 166.1696 and corresponds with the data point 2.5281. I have tried using the following code:
 for k=1:length(spiketimesmatrix)
 dataout(k)=datamatrix(find(spiketimesmatrix>=datamatrix(:,2),1);
 end
I keep getting the first data point as the entire dataoutput.
Not sure if this is clear enough.

Best Answer

Why not use a difference?
First matrix, a, second matrix b:
for i = 1:length(a)
  [m,idx] = min(abs(a(i,2))-b(:,1));
  minVal(i) = a(idx,1);
end
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