How would I define column D as d1=log(c1) in excel? Or column F as f1=row(f1)-1? Solution 1) place the cursor in d1 and go to functions( sigma f symbol) and select logarithm of C1 2) place the cursor in column f1 and go to the address of column f1 ( means where we can see the value of f1, the longest block down the address bar), then click in row f1 and type \'-1\' beside it..