MATLAB: Finding Closest Data Point

closest data pointspikestime

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.

Best Answer

Try something like

% Find all time differences:
timeDiffs = abs(timeStamps - spikeTimes);
% Find out which has the smallest difference:
[minTimeDiff, indexOfMin] = min(timeDiffs);
% Get the value from column 1.
result = dataColumn1(indexOfMin)

Related Solutions

MATLAB: Finding closest distance between two data set for each point

d = pdist2(first_xyz, second_xyz);
[mindist, idx] = min(d, [], 2);

Here first_xyz and second_xyz should be something-by-3 arrays of x, y, z coordinates.

The idx that results will have as many rows as first_xyz has, and the value will be the index of which second_xyz row is closest to that point; the mindist value will tell you how close it is (no more computation will be required.)

If you want the index for each n (second dataset) as to which m it is closest to, then use min(d, [], 1)

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

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

Best Answer

Related Solutions

MATLAB: Finding closest distance between two data set for each point

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

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