Post Reply 
Why The function APP failled to find an extremum in this case
11-15-2015, 10:03 AM (This post was last modified: 11-15-2015 10:06 AM by dg1969.)
Post: #1
Why The function APP failled to find an extremum in this case
Good morning dear "Primers",

Can you explain why the function App failed if i ask for an extremum of \(f(x)\)?
\(f(x)=\frac{1}{9} \cdot (84\cdot x e^{-3\cdot x}-2 e^{-3\cdot x}+2)\)
Code:
f(x):=1/9*(84*x*e^(-3*x)-2*e^(-3*x)+2)

1) I create \(f(x)\) in CAS side. Have you notice the Latex command ? Did you know that ? !
CTRL+C CTRL+V to paste on these post !!! ;o) Thank's to M. PARISSE !
[Image: show.php?id=95373]

2) I choose F1(X)=f(X)
[Image: show.php?id=95375]
Here notice that the EVAL softKey do nothing !? Why ?

3)Plot and choose "EXTREMUM"
[Image: show.php?id=95377]

4) Can't find an extremum !!
[Image: show.php?id=95378][/code]

Thank's for reading.

Didier
Find all posts by this user
Quote this message in a reply
11-15-2015, 11:20 AM
Post: #2
RE: Why The function APP failled to find an extremum in this case
Hi,
in CAS environment, you have to type F1:=f
instead,
and it should work.

primer
Find all posts by this user
Quote this message in a reply
11-15-2015, 02:53 PM
Post: #3
RE: Why The function APP failled to find an extremum in this case
(11-15-2015 11:20 AM)primer Wrote:  Hi,
in CAS environment, you have to type F1:=f
instead,
and it should work.

Thank you , it works. But I continue to think that there is something to improve...
Find all posts by this user
Quote this message in a reply
Post Reply 




User(s) browsing this thread: 2 Guest(s)