HP’s Solve & Integrate-Still ahead of its time.

[Matt Agajanian]

(10-29-2023 06:13 PM)Csaba Tizedes Wrote:  

(10-29-2023 03:14 PM)Matt Agajanian Wrote:  (...) routines & algorithms still considered more advanced than TI & Casio (...)?

HP15C Manual

Open at page 200 and try that sine integral with any CASIO.
I don't believe engineers at CASIO were not ashamed during these decades...

This rings a bell. Several months ago I tried that integral with my
TI 30X Pro MathPrint
TI 36X Pro
Casio fx-115ES Plus (editions 1 and 2)
Casio fx-991ES Plus 2nd Edition
Casio fx-991EX Classwiz and
Casio fx-991CW Classwiz (yes, I actually bought one)
Sharp EL-W516T & X

With the Casio & Sharp models, I needed to put 10^-9 (or smaller) as the lower limit so I could obtain that 1.6054 result. Clearly, the 34C algorithm knows how to integrate better than the TI, Sharp, & Casio which use Simpson's method. I think the 34C uses Romberg method if I'm not mistaken.