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How can I extract a specific row of data from each column of a matrix

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John Harry
John Harry 2016-9-30
回答： James Tursa 2016-9-30
Hello, Matlabbers.
I have 286x8 matrix (X) where each column of data has a different number of numerical data points followed by NaNs to create a length of 268 for each column. I have identified the last row of numerical data in each column using the command Y = sum(isfinite(X)) which returns a 1x8 row of data identifying the final data point of non-NaN values. What I need to do now is extract the data from each column of X corresponding to each value in Y. Nothing I have tried has worked. Does anyone have any suggestions for how to extract these values?
Thanks, John

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采纳的回答

John Harry
John Harry 2016-9-30
I did some extra digging, and was able to get the data I need using a basic for loop (Not sure why a loop with this structure did not cross my mind earlier!). The loop that did the trick was:
for i = 1:length(Y)
X_Y(i) = X(Y(i),i)
end

更多回答（2 个）

Eamon
Eamon 2016-9-30
X(Y(1))
should work to get that data point for the first column of X,
X(Y(2))
for the second column of X, etc.
James Tursa
James Tursa 2016-9-30
X_Y = X(Y + (0:numel(Y)-1)*size(X,1));

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