>? lnvar gives .0866309480 which is correct, but when I try to do 3 years
dimension aval(3)
aval(1)=-70000
aval(2)=12000
aval(3)=15000
lnvar=o.irr(@aval,-10%)
? lnvar gives error message: missing operand


Terry;

Your approach seems correct. All that I can see is that you are looking at two years rather than three. What happens if you increase the "guess" value?

Tom