# [TI-M] Re: math with polar and rectangular (imaginary) vectors

```Hi Peter,

On your calculator go to the [mode] key.  Then high light [darken] the item
"Complex Formate" change the setting from "REAL" to ether "2:RECTANGULAR" to
"3:POLAR,"  depending on which complex formate you want to use.

Paul
----- Original Message -----
To: <ti-math@lists.ticalc.org>
Sent: Thursday, February 06, 2003 5:34 AM
Subject: [TI-M] math with polar and rectangular (imaginary) vectors

> Hi all,
>
> I'm a newbie to the ti community though I've been using these
> calculators  for years. I have a TI-92 and I'm running into trouble
> using this calculator with my circuit analysis coursework. typically
> we're presented with problems that involve polar and rectangular
> coordinates which normally isn't such a big deal however in this case
> the rectangular axis consist of real + imaginary, the calc doesn't like
> this. I get domain errors for simply calculations like. (this is in
> polar complex format)
>
> (4/3) * -2i / (4/3) - 2i {product over the sum}
>
> While in cylind vector format.
>
> If I switch to rectangular vector format I get something that resembles
>
> e^(-33.69*i) * 1.109
>
> This corresponds in polar form of the correct answer as 1.109<-33.69
>
> If i try a ->polar from this point I am also presented with a domain
> error.
>
> My question is, How can I work with vectors containing imaginary
> numbers and convert
> their result to polar form?
>
> Another problem I'm having is the multiplication and division of polar
> vectors. like
>
> [10.<20]
> -----------
> [1.1<-33.7]
>
> Gives me a "data type error" no mater what vector mode I'm in. I don't
> understand.
> the answer should be 9.39 < 53.7. If i do something like a matrix
> divide i.e. "./" i get an answer that is completely wrong. Thanks in