I'm trying to track down a program I saw/used back in the very early
days (ie. 78/79) which would plot functions in either cartesian or polar
plot modes in HGR on the Apple II

You'd edit the program to change a DEF FN... line then RUN it and it
would display the plot.

What I don't know is if it was something written by one of the teachers
in my school/region at the time (In Edinburgh, Scotland) or something
supplied with the Apple II - although I've searched all the disks I have
and not found it.

(Googles not helping me, so I'm suspecting it was written locally)

Does this ring any bells with anyone? If so, then please let me know.

Thanks,

-Gordon

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On 2022-07-03 5:09 p.m., Gordon Henderson wrote:

I'm trying to track down a program I saw/used back in the very early
days (ie. 78/79) which would plot functions in either cartesian or polar
plot modes in HGR on the Apple II

You'd edit the program to change a DEF FN... line then RUN it and it
would display the plot.

What I don't know is if it was something written by one of the teachers
in my school/region at the time (In Edinburgh, Scotland) or something supplied with the Apple II - although I've searched all the disks I have
and not found it.

(Googles not helping me, so I'm suspecting it was written locally)

Does this ring any bells with anyone? If so, then please let me know.

I seem to recall seeing programs like this. I'm sure there are probably
many programs that do this sort of thing and it isn't that hard to
create. They've probably been published as program listings in
magazines as well. Unfortunately, I can't give any direct answer or links.

The ones I remember playing with did "3D" graphs which I found rather
cool looking at the time.

--- SoupGate-Win32 v1.05
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In article <t9utbs$3d8b2$1@dont-email.me>,
Jeff Blakeney <CUTjeffrey_blakeney@yahoo.ca> wrote:

On 2022-07-03 5:09 p.m., Gordon Henderson wrote:

I'm trying to track down a program I saw/used back in the very early
days (ie. 78/79) which would plot functions in either cartesian or polar
plot modes in HGR on the Apple II

You'd edit the program to change a DEF FN... line then RUN it and it
would display the plot.

What I don't know is if it was something written by one of the teachers
in my school/region at the time (In Edinburgh, Scotland) or something
supplied with the Apple II - although I've searched all the disks I have
and not found it.

(Googles not helping me, so I'm suspecting it was written locally)

Does this ring any bells with anyone? If so, then please let me know.

I seem to recall seeing programs like this. I'm sure there are probably
many programs that do this sort of thing and it isn't that hard to
create. They've probably been published as program listings in
magazines as well. Unfortunately, I can't give any direct answer or links.

Thanks. I'm writing another (in my own BASIC dialect, not an Apple one)
and wanted to see if I could run the first one I used all those years
back just for comparision, but it's looking more like something someone
locally might have put together than an Apple demo program now...

The ones I remember playing with did "3D" graphs which I found rather
cool looking at the time.

Not graphs as such, but Graforth was a 3D thing I remember using back
then..

Cheers,

Gordon

--- SoupGate-Win32 v1.05
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On Monday, July 4, 2022 at 7:30:19 AM UTC-7, Gordon Henderson wrote:

Thanks. I'm writing another (in my own BASIC dialect, not an Apple one)
and wanted to see if I could run the first one I used all those years
back just for comparison, but it's looking more like something someone locally might have put together than an Apple demo program now...

I wrote my own polar graph plotter and hi-res to Epson screen dump
back in about 1986, and it used DEF FN as you described. The other
details elude me, as does the source code. One of my college math
professors gave me big kudos when I brought him my hard copies.

Good luck ... I don't remember having any difficulties with it back then,
and I'm pretty sure that you're a better programmer than I ever was.

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