xmgrace: finding the sum of residuals

Question

I am using xmgrace's curve fitting option (DATA-->TRANSFORMATION-->REGRESSION), and I want to find the sum of all residuals^2. xmgrace has an option giving me all the residuals, and I already took the square of this, but I want to find the sum of the squares. How do I do this?

Answer 1

• Identify the set where rediduals^2 is kept. Let's say it is s4.
• Go to tab Window -> Commands. A small window will pop up.
• Assuming you want to sum the y of residual^2 set, type in s5 point 0,sum(s4.y). Press enter. This will add all the y values in set s4 and place it in y of s5.
• If no error pops up, type in updateall. This will update the new set s5.
• The sum of residual^2 will be in s5(y).