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 ???

Question

[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 x1(:,col) = []; end end end

Answer 1

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) = [];