How can i extract Index values of different cell arrays

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Ram 2018-7-29

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评论： Ram 2018-7-30

采纳的回答： jonas

mydata21.mat

在 MATLAB Online 中打开

I want to extract the cell arrays w.r.to the index num,

for w =1:length(mydata)
    %[~,I]= find(mydata{w, 2}(:,2)) = find(mydata{w, 1}(:,1));
    for o = 1:length(mydata{w,2})
        index = find(mydata{w, 2}(:,2) == mydata{w, 1}(:,1)== o);
        mydata{w,3} = 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.

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Ram 2018-7-30

@jonas thanks for your reply. From 1*2 matrix i have max and index values. for example(from data),(0.3076,690) is our max and index values. Now i want to extract the values from 999*2 matrix. where index is 690 ie.,(8.1510,110.9065). but here i want to extract first col only for each cell array matrix. i have same data for min and index values. later i want to find distance between them.

Ram 2018-7-30

编辑：Ram 2018-7-30

@image analyst thanks for your support. above code writtens only my max and index values again, But this is not my required output. here input matrix is 1*2 which has [max ind] values. but we consider only index values in order to find index values in 999*2 matrix. as i said in above. And here other cell/rows cells means to find all index values for each cell (999*2) array from the 1*2 matrix. sorry for inconvienence about explanation.

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jonas 2018-7-30

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编辑：jonas 2018-7-30

在 MATLAB Online 中打开

Something like this should work.

s = load('mydata21.mat')
s=s.mydata21;
c=s(:,2) %arrays with indices
d=s(:,1) %arrays with values
out=cellfun(@(x,y)y(x(2),1),c,d)

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jonas 2018-7-30

编辑：jonas 2018-7-30

在 MATLAB Online 中打开

1. Cellfun is just a clean way of performing operation on multiple cells. In this case you can do the same with a simple loop:

%%Load data
s = load('mydata21.mat')
s=s.mydata21;
%%Preallocate
out=nan(length(s))
%%Loop over each row
for i=1:length(s)
out(i)=s{i,1}(s{i,2}(2));
end

2. If your data is already loaded, just delete the first line and replace the variable with whatever you call it? I suppose you should replace s by mydata?

3. In the cellfun or the loop, just change the column index from 1 to 2.

Ram 2018-7-30