Substract two columns

Substract two columns

onicaonica Posts: 5Questions: 5Answers: 0

after draging a column i call a function. I need this function to compute the difference between the previous two columns( that are in front of the dragged column) in other word col_dragged[1:n]= col.prev_col_dragged[1:n]-col.prev_prev_col_dragged[1:n] where n is the number of rows ...thank you

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