MATLAB: How to get the row and column from a matrix

for loopMATLAB

I have a matrix A I want to find the size of rows and columns of it . How to do it

Best Answer

Below is the code snippet for it .

[row column] = size(A)  % size returns the rows and columns of matrix A

Here is the doc for the same .

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MATLAB: How to iterate through matrix with rows and columns changing by the same value

B = max(A)';

B = zeros(size(A,2),1);
for col=1:size(A,2)
    B(col,1)=max(A(:,col));
end

MATLAB: I have this error msg (Matrix index is out of range for deletion. Error in tray1 (line 31) x1(:,rows) = []; ) what is the problem ???

You are deleting columns of your matrix x1 in the loop, so its size has changed (moreover, you skip some columns).

To avoid this, you can store the index of the column you want to delete in the loop and delete them only when the loop is finished:

colToDelete = [];
[rows, columns] = size(x1); 
for col = 1 : columns
    sum = 0;
    for row = 1 : rows % Now get the mean over all values in this column.
        columnMeans(col) = sum / rows;
        if columnMeans(col)> avgcut || columnMeans(col)< avgcut
            colToDelete = [colToDelete,col];
        end
    end
end
x1(:,colToDelete) = [];

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Related Solutions

MATLAB: How to iterate through matrix with rows and columns changing by the same value

MATLAB: I have this error msg (Matrix index is out of range for deletion. Error in tray1 (line 31) x1(:,rows) = []; ) what is the problem ???

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