Re: how to transform rectangular to polar with 49g+ ???

On Tue, 16 Aug 2005 09:12:11 -0500, Christian wrote:

With all the old HPs and with the 33s it is very simple
to access the key R->P or P->R to transform rectangle coordinates
to polar coordinates.
f.e.: 3 4 [R-P] ---> 5 36,87°
How can I access this command on the 49G+ ???


The reason there is none is that on *old* calcs
you had to use *two* separate "real number" objects (stack levels)
to store two coordinates, and the possible meanings of the coordinates
(whether rectangular or polar, and if polar then what degree mode)
had to be kept track of in your mind,
not that the calc itself could remember.

Calculations using such "two-part" objects were also
a formidable task to carry out.

On the newer HP calcs, *one* object can represent a *pair*
of coordinates together, and it has only *one* internal form
(which happens to be rectangular); the "polar" form(s)
are only alternate *display* options (and are also understood
by the built-in *compiler* which replaced the number-only input
of the old calcs), and calculations upon these new multi-part
objects are simple, built-in commands, so there has been
a deep evolution in the fundamental style of calculation
between the old calcs and HP48/49,
which makes the "old" and "new" ways a bit incompatible,
just like any different human generations :)

Of course, you can make the new calcs act old if you like, e.g.:

P->R:  \<< -16. SF \->V2 -16. CF V\-> \>>

R->P:  \<< -16. CF \->V2 -16. SF V\-> \>>

To preserve the original flag state, if desired,
insert RCLF UNROT at the beginning and ROT STOF at the end
of each of the above.

Time traveling back to 2002 for more verbose discussions:
http://groups.google.com/group/comp.sys.hp48/msg/8edd5d9ee0e1a83b
http://groups.google.com/group/comp.sys.hp48/msg/a803ba683a337dbe

Good grief, the "beta" has vanished from new Google Groups URLs;
what miracles a $4 billion new stock offering can accomplish :)
http://www.usatoday.com/tech/news/2005-08-18-google_x.htm

[r->][OFF]
.

Relevant Pages

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