HP35s Order of arguments with RPN

11252019, 12:44 PM
Post: #1




HP35s Order of arguments with RPN
Hello,
I'm reading the manual for the HP35s and I'm confused with RPN input mode on page 120. The top display line of the calculator shows the y register and the lower line shows the x register (Page 22). Now page 120 shows how to enter 6C4 in both modes. In RPN the 6 stands in Y register and 4 in X when nCr is pressed which would translate to nCr(4,6) if the function notation is f(x,y). Also if this is right the xth root of y exception mentioned on the page would be none. But in ALG mode nCr(6,4) is entered, which would translate to f(y,x). What am I missing in my understanding? 

11252019, 09:32 PM
Post: #2




RE: HP35s Order of arguments with RPN
They seem to have arranged things so that you enter n (the larger number) first, then r, regardless of whether you're using RPN or ALG mode.
On older HP models, e.g. HP15C, the key is marked Cy,x, where y is n. Cambridge, UK 41CL/DM41X 12/15C/16C DM15/16 17B/II/II+ 28S 42S/DM42 32SII 48GX 50g 35s WP34S PrimeG2 WP43S/pilot Casio, Rockwell 18R 

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