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From: John H Meyers on 14 Nov 2007 18:09
On Wed, 14 Nov 2007 16:41:58 -0600, SMC wrote:

> I am having difficulty graphing on my 48SX.
> It will not purge the old graph.

What's plotted is what's found stored in variable 'EQ'
within the current directory; to change plots,
the user must first store the new equation into that 'EQ' variable.

> I have purged the 'X' variable

Irrelevant.

> ERASED the previous graph

Useful when you don't want to keep the previous drawing,
but doesn't change the contents of EQ.

> Neither DRAW or AUTO plot the new equation stored in EQ

AUTO is a scaling option; DRAW plots whatever is stored in 'EQ'

Command RCEQ recalls the current content of 'EQ'

Command STEQ stores the level-1 object into 'EQ'

ERASE 'X' STEQ DRAX DRAW PICTURE @ Draws 'Y=X'

ERASE 'X^2/2' STEQ DRAX DRAW PICTURE @ Draws 'Y=X^2/2'

ERASE 'X' STEQ DRAX DRAW 'X^2/2' STEQ DRAW PICTURE @ Draws both

ERASE { 'X' 'X^2/2' } STEQ DRAX DRAW PICTURE @ Also draws both

[r->] [OFF]
From: curtland on 14 Nov 2007 19:56
On Nov 14, 3:09 pm, "John H Meyers" <jhmey...(a)nomail.invalid> wrote:
> On Wed, 14 Nov 2007 16:41:58 -0600, SMC wrote:
> > I am having difficulty graphing on my 48SX.
> > It will not purge the old graph.
>
> What's plotted is what's found stored in variable 'EQ'
> within the current directory; to change plots,
> the user must first store the new equation into that 'EQ' variable.
>
> > I have purged the 'X' variable
>
> Irrelevant.
>
> > ERASED the previous graph
>
> Useful when you don't want to keep the previous drawing,
> but doesn't change the contents of EQ.
>
> > Neither DRAW or AUTO plot the new equation stored in EQ
>
> AUTO is a scaling option; DRAW plots whatever is stored in 'EQ'
>
> Command RCEQ recalls the current content of 'EQ'
>
> Command STEQ stores the level-1 object into 'EQ'
>
> ERASE 'X' STEQ DRAX DRAW PICTURE @ Draws 'Y=X'
>
> ERASE 'X^2/2' STEQ DRAX DRAW PICTURE @ Draws 'Y=X^2/2'
>
> ERASE 'X' STEQ DRAX DRAW 'X^2/2' STEQ DRAW PICTURE @ Draws both
>
> ERASE { 'X' 'X^2/2' } STEQ DRAX DRAW PICTURE @ Also draws both
>
> [r->] [OFF]

Thanks for the help. I have not used this in ten years.

I do not see the PICTURE command, but I can plot them individually.
When I try to plot them together, I only get the line.

I do not get the correct graph for x^4-4x^2+x

This is frustrating as I know I did stuff like this before.
From: JYA on 14 Nov 2007 20:52
On 2007-11-15 11:56:46 +1100, curtland(a)earthlink.net said:
> Thanks for the help. I have not used this in ten years.


>
> I do not see the PICTURE command, but I can plot them individually.
> When I try to plot them together, I only get the line.

you do not need to see it for it to work.

Just follow John instruction and you will be fine.

>
> I do not get the correct graph for x^4-4x^2+x

did you enter the equation properly for a start?
it has to be all in uppercase, and there's no implicit multiplication on the HP
so you have to type
X^4-4*X^2+X


--
They who would give up an essential liberty for temporary security,
deserve neither liberty or security (Benjamin Franklin)

From: curtland on 14 Nov 2007 21:15
On Nov 14, 5:52 pm, JYA <nos...(a)nospam.blah> wrote:
> On 2007-11-15 11:56:46 +1100, curtl...(a)earthlink.net said:
>
> > Thanks for the help. I have not used this in ten years.
>
> > I do not see the PICTURE command, but I can plot them individually.
> > When I try to plot them together, I only get the line.
>
> you do not need to see it for it to work.
>
> Just follow John instruction and you will be fine.
>
>
>
> > I do not get the correct graph for x^4-4x^2+x
>
> did you enter the equation properly for a start?
> it has to be all in uppercase, and there's no implicit multiplication on the HP
> so you have to type
> X^4-4*X^2+X
>
> --
> They who would give up an essential liberty for temporary security,
> deserve neither liberty or security (Benjamin Franklin)

Yes I did enter it correctly. I tried both in equation writer and
manually. I currently have a broken wrist so it is easier to type in
lower case on the computer with one hand.


..... The range was whacked. When I choose AUTO it sets the y-scale to
-1447.753 to 9610.

It was scaled too small to see anything, Is there a way to "fine
tune" the AUTO routine?

Thanks again


From: John H Meyers on 14 Nov 2007 22:01
On Wed, 14 Nov 2007 20:15:53 -0600, wrote:

>> 'X^4-4*X^2+X' STEQ ERASE AUTO DRAX DRAW PICTURE

This is not unpresentable with the default X range
(-6.5 to +6.5), but it does not show any detail near X=0.

> .... The range was whacked.When I choose AUTO it sets the y-scale to -1447.753 to 9610.
>
> It was scaled too small to see anything,
> Is there a way to "fine tune" the AUTO routine?

AUTO sets the vertical range to the MAX and MIN function values
over the entire horizontal plotting range.

You can "fine tune" the horizontal range
to avoid extreme function values,
or to focus on the region of interest; you can alternatively
set your own vertical range, rather than use AUTO.

Commands XRNG and YRNG may be used to set the H & V ranges;
each expects two real values (in any order) as arguments.

My first HP48 was an HP48G, which came with a pretty extensive
user manual, although "advanced" commands were explained only
in an optional AUR; what sort of documentation was provided
(or optional) for the HP48S[X]?

Any of the original HP48 commands that are mentioned
even in the latest (HP50G) downloadable manuals
will still generally work the same,
as this is still one general series of products,
just adding new rooms to an old, original house.

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