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HP Forum Archive 16

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Problems relearning 48sx
Message #1 Posted by Troy on 24 Aug 2006, 2:18 p.m.

12 years after graduating college, I'm relearning how to use my 48sx for grad school.

I've tried following the examples in the manual for step-wise differentiation and integration, but when I press EVAL, I just get undefined name errors instead of the next screen shot shown in the book.

Help!

      
Re: Problems relearning 48sx
Message #2 Posted by Kiyoshi Akima on 24 Aug 2006, 5:47 p.m.,
in response to message #1 by Troy

What's the status of system flags -2 and -3? They control symbolic/numeric evaluation mode. Also make sure you've got the right case. 'X' is not the same variable as 'x'.

            
Little more help pls :)
Message #3 Posted by Troy on 25 Aug 2006, 1:52 a.m.,
in response to message #2 by Kiyoshi Akima

How do I see flags -2 & -3?

And I'm following the keystrokes in the manual exactly, so if it's a case problem, it's HP's.

                  
Re: Little more help pls :)
Message #4 Posted by Vieira, Luiz C. (Brazil) on 25 Aug 2006, 2:11 a.m.,
in response to message #3 by Troy

Hi;

to see the status of these flags (and any other) you may follow these steps: (there are others, these are the ones I thought being the easiest)

[PRG][TEST] ([TEST] is a softkey; press the key correponding to [F])
[NXT][NXT]  (this brings the softmenu for flags)
2 [+/-]     (or any sequence that puts flag # in the stack)
[FS?]       (softkey; asks if flag #-2 is set)
If you see a '1' (one) in the stack level 1 after [FS?], then flag -2 is set. If you see a '0'(zero), it is cleared. For testing other flags, like -3, simply pres:
3 [+/-] [FS?]
and check resulting value in stack level 1.

I hope this clarifies a bit.

Cheers.

Luiz (Brazil)

            
Re: Problems relearning 48sx
Message #5 Posted by Troy on 27 Aug 2006, 6:39 p.m.,
in response to message #2 by Kiyoshi Akima

Flag -2 is 0, -3 is 1.

      
Re: Problems relearning 48sx
Message #6 Posted by reader on 25 Aug 2006, 10:21 a.m.,
in response to message #1 by Troy

The great examples in most of the HP manuals require the calculator to have particular settings configured for the example.

Try checking the earlier sections of the chapter your working in.

Sometimes you've got to go back to move forward.

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