[HP41] Lambert function RPN; question

[Didier Lachieze]

(12-26-2022 12:13 PM)floppy Wrote:  I was ready to upload a recommendable function from there in order to understand if/how it works:
https://github.com/isene/hp-41_wlambert/...lambert.41
BUT: What is the line 37 (=RCL M) doing there?
I suppose the 2 programs are calculating L(x) in the high-branch area and low branch area of the lambert calculation. https://en.wikipedia.org/wiki/Lambert_W_function
For the reason the use inputs/outputs are still a bit cryptic for me for the LW and LWM, any remarks/comments are welcome.

Here is the original discussion from where this program is originated : Help solving equation.

You should find there more details about the inputs/outputs of the functions.

Line 37 (=RCL M) is between the end of the LW (RTN) and the beginning of LWM so I suppose it’s there to calculate LWM(x) just after LW(x) by simply pressing R/S.