Hi,

I want to make a function for a sum that has two different options for
each term, depending on a condition. E.g.

F(m) = sum(n=1, 10, if( m*n<0, m*n+2, m*n+8))

How do I put the "else if m*n>0 then m*n+8" into the Sage statement:

sum( m*n +2 for n in range(1,10) if m*n<0 ) ?

Thank you

Kim

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