Replacing elements in Array

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Angela
Angela am 20 Jul. 2012
I have two 48 x 61 matrices, LE and Q. If the first and last row value of LE are the same, for those rows, I want the values of Q to equal Q(:, 61).
This is what I initially wrote, but am getting an error message.
C = find(LE(:,1) == LE(:,61)); % Outputs rows in which first and last values are equivalent.
Q(C,:) = Q(C, 61); % For all values in rows C, make every value in that row (of Q) the last value in row Q.
Error: subscript assignment dimension mismatch.
Any suggestions? Thanks!
  1 Kommentar
Image Analyst
Image Analyst am 20 Jul. 2012
It's always nice if the poster supplies some sample data in advance to make it easy for people to try things for her. I mean, why make it hard for people to help you?

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Akzeptierte Antwort

Jan
Jan am 20 Jul. 2012
Q(C, :) = repmat(Q(C, 61), 1, size(Q, 2));

Weitere Antworten (1)

Albert Yam
Albert Yam am 20 Jul. 2012
When length(C) > 1 , Matlab doesn't know how to replace the values.
(length(C) x 61) matrix , and a length(C) vector
If you loop it for every C, it should work, someone else might be able to point out a way without looping.
C = find(LE(:,1) == LE(:,61));
for ii=1:length(C)
Q(C(ii),:) = Q(C(ii), 61);
end

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