Advice to buy an HP
04-19-2015, 09:34 PM (This post was last modified: 04-19-2015 11:26 PM by Thomas Klemm.)
Post: #41
 Thomas Klemm Senior Member Posts: 1,688 Joined: Dec 2013
RE: HP-80
(04-19-2015 09:15 PM)bshoring Wrote:  For logarithms of other bases, you would use enter the base:
Press Save, 1 - 100 X, then i and 1 PV, the number and FV and press n to get the result.

To calculate logAB we could use the Δ% key:

1
SAVE↑
A
Δ%
i
1
PV
B
FV
n

(04-19-2015 09:15 PM)bshoring Wrote:  So for a logarithm base 2 of 256, you take 2-1 * 100 ( or simply enter 100) and press i, 1 PV 256 FV and pressing n will yield 8. The Ln of 256 will still be in the Y-Register.

That would then be:

1
SAVE↑
2
Δ%
i
1
PV
256
FV
n

Cheers
Thomas
04-19-2015, 09:34 PM
Post: #42
 Steve Simpkin Senior Member Posts: 755 Joined: Dec 2013
RE: Advice to buy an HP
(04-19-2015 09:11 PM)Cancuino Wrote:  Although I've already bought the HP, I've just read about the TI 89 titanium, is it that good?. I've never tried a TI and want to be sure that the HP is the best choice.

Thanks.

Since you have been using a HP48G+ for the past 18 years, i think a HP-50 is a great choice and is much better than a TI-89 which is still largely the same model that was introduced in 1998.
04-19-2015, 09:37 PM
Post: #43
 Cancuino Member Posts: 51 Joined: Apr 2015
RE: Advice to buy an HP
I can't think about not using RPL, I'm really used to it.
Like I said before, I've never used a TI and have only seen it on the internet but it looks like a step behind the HP in terms of materials.
04-19-2015, 10:22 PM
Post: #44
 rprosperi Super Moderator Posts: 5,293 Joined: Dec 2013
RE: Advice to buy an HP
(04-19-2015 09:37 PM)Cancuino Wrote:  I can't think about not using RPL, I'm really used to it.
Like I said before, I've never used a TI and have only seen it on the internet but it looks like a step behind the HP in terms of materials.

I apologize, I forgot from your initial notes you've used RPL for many years. No question moving to 50g is a good move. MUCH faster, more capable and many more functions. The keyboard layout will seem very busy and confusing at first, but your fingers will regain their muscle memory pretty quickly. Also, much has been written about the "small Enter key in the wrong place" but this too is really very easy to get used to. And once you do, the 48 Enter key will seem odd.

--Bob Prosperi
04-19-2015, 11:57 PM
Post: #45
 Jlouis Senior Member Posts: 705 Joined: Nov 2014
RE: Advice to buy an HP
(04-19-2015 09:37 PM)Cancuino Wrote:  I can't think about not using RPL, I'm really used to it.
Like I said before, I've never used a TI and have only seen it on the internet but it looks like a step behind the HP in terms of materials.

I have the TI 89 titaneum emulator for android. It is nice, but not comparable to the 50g, IMHO.
04-20-2015, 12:16 AM
Post: #46
 Marcio Senior Member Posts: 438 Joined: Feb 2015
RE: Advice to buy an HP
(04-19-2015 11:57 PM)Jlouis Wrote:  I have the TI 89 titaneum emulator for android. It is nice, but not comparable to the 50g, IMHO.
The TI-Nspire CX on the other hand is a huge seller in the US. Great competitor to the 50g and Prime at the same time.
04-21-2015, 02:42 PM
Post: #47
 Cancuino Member Posts: 51 Joined: Apr 2015
RE: Advice to buy an HP
Hi, I've just received the 50g and I'm really pleased. I'm trying to solve the formula I have upload but I get the "invalid user function" error. I wrote the equation on the equation writer and tried to EVAL it but nothing. Any clues?.

Thank you.

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04-21-2015, 02:55 PM
Post: #48
 Marcio Senior Member Posts: 438 Joined: Feb 2015
RE: Advice to buy an HP
(04-21-2015 02:42 PM)Cancuino Wrote:  Hi, I've just received the 50g and I'm really pleased. I'm trying to solve the formula I have upload but I get the "invalid user function" error. I wrote the equation on the equation writer and tried to EVAL it but nothing. Any clues?.

Thank you.
Have you tried the Equation solver?

RIGHT SHIFT, 7, then pick SOLVE EQUATION.
04-21-2015, 04:27 PM
Post: #49
 Cancuino Member Posts: 51 Joined: Apr 2015
RE: Advice to buy an HP
Yes, I've tried but I get the same error, I think that maybe there is a variable that is not working the way it should.
04-21-2015, 04:34 PM
Post: #50
 Thomas Ritschel Member Posts: 66 Joined: Feb 2014
RE: Advice to buy an HP
(04-21-2015 02:42 PM)Cancuino Wrote:  Hi, I've just received the 50g and I'm really pleased. I'm trying to solve the formula I have upload but I get the "invalid user function" error. I wrote the equation on the equation writer and tried to EVAL it but nothing. Any clues?.

Make sure to use multiplication signs between variable names and before an opening parenthesis, e.g. write k*h*(9f+4h) instead of kh(9f+4h).
04-21-2015, 04:35 PM
Post: #51
 Marcio Senior Member Posts: 438 Joined: Feb 2015
RE: Advice to buy an HP
(04-21-2015 04:27 PM)Cancuino Wrote:  Yes, I've tried but I get the same error, I think that maybe there is a variable that is not working the way it should.

How is that possible?
What variable are you trying to solve for?
04-21-2015, 04:59 PM
Post: #52
 Cancuino Member Posts: 51 Joined: Apr 2015
RE: Advice to buy an HP
I've found the problem, rookie mistake. For example in a equation: 4k(f+h) I didn't include the multiplication symbol before the parentheses "4*k(f+h)" instead of "4*k*(f+h)". It seems everything is working now.
BTW, the difference of speed between the 48G and the 50G is amazing.
04-21-2015, 05:03 PM
Post: #53
 Cancuino Member Posts: 51 Joined: Apr 2015
RE: Advice to buy an HP
(04-21-2015 04:34 PM)Thomas Ritschel Wrote:
(04-21-2015 02:42 PM)Cancuino Wrote:  Hi, I've just received the 50g and I'm really pleased. I'm trying to solve the formula I have upload but I get the "invalid user function" error. I wrote the equation on the equation writer and tried to EVAL it but nothing. Any clues?.

Make sure to use multiplication signs between variable names and before an opening parenthesis, e.g. write k*h*(9f+4h) instead of kh(9f+4h).

Thank you Thomas ;D. That was the error.
04-21-2015, 05:19 PM
Post: #54
 Cancuino Member Posts: 51 Joined: Apr 2015
RE: Advice to buy an HP
When I try to solve some var a pop up window shows asking me to change from exact to aprox mode. Why is that happening?.
04-21-2015, 05:19 PM
Post: #55
 Marcio Senior Member Posts: 438 Joined: Feb 2015
RE: Advice to buy an HP
(04-21-2015 04:59 PM)Cancuino Wrote:  BTW, the difference of speed between the 48G and the 50G is amazing.
Ha. Check THIS out.
04-21-2015, 05:26 PM
Post: #56
 Tugdual Senior Member Posts: 756 Joined: Dec 2013
RE: Advice to buy an HP
(04-21-2015 05:19 PM)Marcio Wrote:
(04-21-2015 04:59 PM)Cancuino Wrote:  BTW, the difference of speed between the 48G and the 50G is amazing.
Ha. Check THIS out.
Speed is not all... of course if you fancy graphics the Prime is from far better.
Note the 3D graphics are not even native... this is a user application.

Had the Prime before and moved on the 50g.
Have no regret though the 50g is thick and ugly.
The day we have a dark Prime with a Saturn emulator that runs the 50g ROM, I may reconsider my choice. But for now don't spoil Cancuino's joy with fallacious videos, he did the right choice.
04-21-2015, 05:43 PM (This post was last modified: 04-21-2015 05:43 PM by Sukiari.)
Post: #57
 Sukiari Member Posts: 170 Joined: Dec 2014
RE: Advice to buy an HP
(04-21-2015 05:19 PM)Cancuino Wrote:  When I try to solve some var a pop up window shows asking me to change from exact to aprox mode. Why is that happening?.

You're invoking the computer algebra system. Sadly HP didn't find it profitable to include a printed manual but there should be documentation on the CD and HP's web site.

The 50G is a very powerful instrument but being a massive superset of the 48 series it will require some getting used to. I would consider getting a package called HLP49 at the very least - it's an online function reference and help system for the 49/50 series. There is also a fellow on this board who has made some printed 50G manuals, who may or may not make another run but it wouldn't hurt to post to that thread.
04-21-2015, 05:53 PM (This post was last modified: 04-21-2015 06:09 PM by Marcio.)
Post: #58
 Marcio Senior Member Posts: 438 Joined: Feb 2015
RE: Advice to buy an HP
(04-21-2015 05:26 PM)Tugdual Wrote:  Speed is not all... of course if you fancy graphics the Prime is from far better.
Note the 3D graphics are not even native... this is a user application.

Speed means a lot to me because the Prime is now my pocket PC. It would be very cumbersome to solve PDEs, ODEs and perform heavy calc stuff on a machine like the 50g. I like it very much but RPL is not very useful for particular cases as these.
Having some experience with Matlab/Scilab/Octave, I find HPPPL very useful and easy as it is a bit similar to the programming languages of these applications.

Had the Prime before and moved on the 50g.
Have no regret though the 50g is thick and ugly.

I will have to disagree with you on this one too. I think the 50g is prettier. I also like the leather case better than the plastic case on the Prime. A matter of personal choice.

The day we have a dark Prime with a Saturn emulator that runs the 50g ROM, I may reconsider my choice.

I don't think that is going to happen.

But for now don't spoil Cancuino's joy with fallacious videos, he did the right choice.

Of course he did. But that is not gonna stop him from trying the Prime emulator when or if he needs speed.
04-21-2015, 06:13 PM
Post: #59
 Cancuino Member Posts: 51 Joined: Apr 2015
RE: Advice to buy an HP
(04-21-2015 05:43 PM)Sukiari Wrote:
(04-21-2015 05:19 PM)Cancuino Wrote:  When I try to solve some var a pop up window shows asking me to change from exact to aprox mode. Why is that happening?.

You're invoking the computer algebra system. Sadly HP didn't find it profitable to include a printed manual but there should be documentation on the CD and HP's web site.

The 50G is a very powerful instrument but being a massive superset of the 48 series it will require some getting used to. I would consider getting a package called HLP49 at the very least - it's an online function reference and help system for the 49/50 series. There is also a fellow on this board who has made some printed 50G manuals, who may or may not make another run but it wouldn't hurt to post to that thread.

Thank you Sukiari.
04-21-2015, 06:16 PM
Post: #60
 Cancuino Member Posts: 51 Joined: Apr 2015
RE: Advice to buy an HP
(04-21-2015 05:19 PM)Marcio Wrote:
(04-21-2015 04:59 PM)Cancuino Wrote:  BTW, the difference of speed between the 48G and the 50G is amazing.
Ha. Check THIS out.

I've seen that kind of videos Marcio but I think that speed is not the main difference between the 50 and the Prime, they are completely different machines and being programming my main concern I think the 50g is a great calculator.
Besides, I'm used to my old 48 so anything above it looks like airspace technology to me ;D.
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