F' on hp 15c le
03-12-2016, 11:13 PM
Post: #1
 lrdheat Senior Member Posts: 455 Joined: Feb 2014
F' on hp 15c le
Can't remember program using complex capability of hp 15c le to solve f'x = 0 in order to find a max/min of f'x.

This was from several years ago...somebody contributed a real neat short elegant program!

f(x) is defined in program 0, f'(x)would be in program 1, dx in register .0, "x" result in program 1 would be plugged into program 0 to find f(X) at that point.
03-12-2016, 11:35 PM
Post: #2
 Gerson W. Barbosa Senior Member Posts: 1,132 Joined: Dec 2013
RE: F' on hp 15c le
This one, perhaps?

03-12-2016, 11:42 PM (This post was last modified: 03-12-2016 11:42 PM by Marcio.)
Post: #3
 Marcio Senior Member Posts: 438 Joined: Feb 2015
RE: F' on hp 15c le
That's pure awesomeness.
Thanks for posting.
03-13-2016, 12:26 AM
Post: #4
 lrdheat Senior Member Posts: 455 Joined: Feb 2014
RE: F' on hp 15c le
That's the one!

I'm glad that the post included my struggle to understand the problem with using change sign with complex numbers as well...would have forgotten that!
03-13-2016, 07:28 AM
Post: #5
 Ángel Martin Senior Member Posts: 933 Joined: Dec 2013
RE: F' on hp 15c le
(03-13-2016 12:26 AM)lrdheat Wrote:  That's the one!

I'm glad that the post included my struggle to understand the problem with using change sign with complex numbers as well...would have forgotten that!

It seems it's time to dust off the 41Z... more to come.
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