Financial use of Qalculate ! Yield?

[kiers]

I have a Present Value (PV), Future Value(FV) at N years into the future. How do i find the interest that equates Fv to Pv? There is no simple function. The manual says "rate()" function, but it does not exist in my version 3.22.0.

[hanna-kn]

If you are not able to update to a more recent version (3.22 is four years old), I recommend that you use an equation (preferably using newtonsolve function), e.g. newtonsolve(fv(x, 12, 1000) = -20000, 0.1). The rate function uses an equation with the pmt function, e.g. newtonsolve(pmt(x, 10, 10000) = -1500, 0.1).

[kiers]

Thank you! (i had installed it using my distribution's standard package manager, and it NEVER got an update, !) Got the latest 5.4.0 after you woke me! problem solved.