"SOLVER" function as in Excel

[rawi]

Quote: Sorry, why in "FUNCX" there is no ▶Q1, in the line before "RETURN",?

You are totally right. This was an error by me I corrected in my post. I came to the right solution with the wrong function, so I did not realize it. But it works as well with the corrected function.

Quote:One last question: if I have to interpolate a series of data: X = {7,2,6,4,5} Y = {6,2,4,9,3}, how can I utilize your program ?

You can change it to fit data. Unfortunately I did not do that for the HP Prime but for the TI 89. You will find those programs here: https://www.ticalc.org/archives/files/fi...47622.html
and here: https://www.ticalc.org/archives/files/fi...47644.html

Perhaps this helps a little.

Thank you for showing me the error.

Best

rawi