HP Forums / HP Museum Forums / Old HP Forum Archives v / HP Prime 'where' function

Linear Mode
HP Prime 'where' function


▼
Post: #2
10-29-2013, 06:19 AM
bluesun08 Offline
Unregistered
Posts: 207
Threads: 48
Joined: Feb 2010

Is there a 'where' function key ( | ) in HP Prime, so that i can do for example:

f(x):=k*x^2

f(3) | k=4

Find
▼
Post: #3
10-29-2013, 06:41 AM
Walter B Offline
Unregistered
Posts: 4,587
Threads: 105
Joined: Jul 2005

??

IMHO, 4*3^2 = 36.

d:-?

Find
▼
Post: #4
10-29-2013, 06:47 AM
bluesun08 Offline
Unregistered
Posts: 207
Threads: 48
Joined: Feb 2010

Thank you joker, but as i write this was only an EXAMPLE.

Find
▼
Post: #5
10-29-2013, 06:59 AM
Walter B Offline
Unregistered
Posts: 4,587
Threads: 105
Joined: Jul 2005

Without a Prime, I'd simply define that function being f(x, k) and calculate f(3, 4). What's wrong with that approach?

d:-?

Find
Post: #6
10-29-2013, 06:47 AM
From Hong Kong Offline
Unregistered
Posts: 125
Threads: 5
Joined: Jun 2008

Choose the 3rd template in the top row after pressing the template button.

Edited: 29 Oct 2013, 6:49 a.m.

Find
▼
Post: #7
10-29-2013, 06:50 AM
bluesun08 Offline
Unregistered
Posts: 207
Threads: 48
Joined: Feb 2010

Is there also a solution without the template? (like in HP 50g RS TOOL)

Find
▼
Post: #8
10-29-2013, 06:57 AM
From Hong Kong Offline
Unregistered
Posts: 125
Threads: 5
Joined: Jun 2008

As far as I know, no!

Find
▼
Post: #9
10-29-2013, 06:59 AM
bluesun08 Offline
Unregistered
Posts: 207
Threads: 48
Joined: Feb 2010

What a pity!

Find
▼
Post: #10
10-29-2013, 07:17 AM
Joe Horn Offline
Unregistered
Posts: 153
Threads: 7
Joined: Jun 2008

Quote:
What a pity!

It's a pity that "|" requires TWO keystrokes (or, to be precise, one keystroke and one tap)? The only way to reduce that would be to put it on a primary key, losing whatever is on that key now.

Find
Post: #11
10-29-2013, 11:24 AM
Steve Keeley Offline
Unregistered
Posts: 21
Threads: 1
Joined: Feb 2009

Try the substitute command (on the CAS/Algebra menu):

subst(f(3), k=4)

Find
▼
Post: #12
10-29-2013, 05:18 PM
bluesun08 Offline
Unregistered
Posts: 207
Threads: 48
Joined: Feb 2010

An ideal place for the "|"-sign would be SHIFT 6.

Find
▼
Post: #13
10-29-2013, 06:56 PM
Joe Horn Offline
Unregistered
Posts: 153
Threads: 7
Joined: Jun 2008

Quote:
An ideal place for the "|"-sign would be SHIFT 6.

That would require three strokes (shift, 6, |). Its current location only requires two (template, |).

Hey, I just noticed that both the 50g and Prime require exactly the same finger travel to press "|". On the 50g, the distance between the right-shift key and the TOOL key is 3 inches (7.5 cm), and on the Prime, the distance between the template key and the "|" on the screen is exactly the same. Same number of presses, and same finger travel. Hmmm.

Find

Forum Jump: