Plus42 Equations, Preview Release

[Klaus Overhage]

I tried 18 equations successfully and didn't find a discrepancy until the nineteenth. The equation for the gamma function on the website http://www.rskey.org/hp19bii supplies negative values ​​for X greater than 0 with PLus42. To try it out, you have to change a comma into a colon beforehand (Q:Σ instead of Q,Σ) and make ABS (i) better ABS (I):

Code:

G=(-1)^Σ(I:X:0:1:1)÷EXP(Σ(I:X:15:1:LN(ABS(I))))×L(Q:Σ(I:X:15:1:1)+X)^Q÷EXP(Q)×SQRT(2​×PI÷Q)×EXP(((((1÷1188÷SQ(Q)-1÷1680)÷SQ(Q)+1÷1260)÷SQ(Q)-1÷360)÷SQ(Q)+1÷12)÷Q)

The problem is at the beginning of the equation in G = (-1)^Σ(I:X:0:1:1) or more simply in G=Σ(I:X:0:1:1). On the HP-17B, this form returns the value 0 for all X>0, but the Plus42 returns 1.

I love the Solve functionality of the HP calculators and I'm excited about Plus42. Thanks a lot for this.