Use index from max() to extract matching values from another array
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Suppose I have 2 n x m arrays A and B and I get the maximum element of each column of A with
[~,I] = max(A)
Now I want to use I to extract the elements of B that correspond to the max element of each column of A.
For example (the example itself is of no particular interest)
A = rand(5)
B = A.^2
[~,I] = max(A)
Now I would like to have a one line command that extracts from B a row vector consisting of, for each j, the I'th element of column j.
Thanks!
采纳的回答
David Young
2014-12-16
Bmax = B(sub2ind(size(B), I, 1:size(B,2)))
4 个评论
Leo Simon
2014-12-16
Ram
2018-7-29
Hello,i am facing similar problem. my code is
for w =1:length(mydata)
%[~,I]= find(mydata{w, 5}(:,2)) = find(mydata{w, 1}(:,1));
for o = 1:length(mydata{w,5})
index = find(mydata{w, 5}(:,2) == mydata{w, 1}(:,1)== o);
mydata{w,7} = index;
end
end
i have a cell which contains max and its index values in each row. Now i want to find max index values in another cell and extract those values( matrix 1*2, here i want to extract only 1st col value only). for ex. [M,I] = [2,295]. 295 index value of its max value in certain row, let say (6,26321) is the extracted index value in another cell. extract value is 6(1st col) similarly all other row cells matrix. Thanks in advance.
Leo Simon
2018-7-29
thanks for responding, attached file as max with its indexand mydata has to find those index values and place it to a new cell. for example, i have index value 690, i am finding in mydata which has (8.1510,110.9065) but i need only first col value only for every index.
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