# Polar and Cartesian conversions in derive 6.1

Discussion in 'Math' started by Dawud Beale, Apr 30, 2012.

1. ### Dawud Beale Thread Starter Member

Feb 10, 2012
275
7
Hi all

Anyone know how to convert between cartesian and polar and vice versa in derive? Also addition, subtraction and other functions of complex numbers?

Any info is greatly appreciated. thanks

Feb 24, 2006
10,340
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3. ### Dawud Beale Thread Starter Member

Feb 10, 2012
275
7
thanks but I understand complex numbers, I need to know how to do them on derive 6.1 specifically. i.e. how to input them using derive 6.1

4. ### 1chance Member

Nov 26, 2011
42
184
What program is this? I could tell you how to go between forms using a graphing calculator, but I'm not sure what "derive 6.1" is--is this using the TI-inspire or perhaps an excel program?

5. ### SgtWookie Expert

Jul 17, 2007
22,183
1,728
Source: http://en.wikipedia.org/wiki/Derive_(computer_algebra_system)

It was used in TI-89 and TI-92 calculators.

Last edited by a moderator: Apr 30, 2012
6. ### Dawud Beale Thread Starter Member

Feb 10, 2012
275
7
I'm using the PC based program. Its pretty standard and taught in most British College's and Universities.

If anyone uses it frequently and is able to help me then let me know. thanks

7. ### Papabravo Expert

Feb 24, 2006
10,340
1,850
I know you know about complex numbers. What you seem to be missing is the knowledge to go from one form (Cartesian) to the other (polar) and vice versa. That material is in there if you read carefully.

I'll check my TI-92 to see if there is a 1-key solution. There might be.

8. ### Dawud Beale Thread Starter Member

Feb 10, 2012
275
7
i specifically need to know how to do it on the PC based derive 6.1

Its all well and good knowing how to do mathematical techniques by hand but when using them in real life engineering situations you just need to bang them into your technology, you wouldnt sit there scribbling away working out every differential equation, matrix or complex number calculation by hand, its important to be able to use the technology to solve the problems.

i quite like derive so am trying to learn how to do everything i need on there. the uni encourages using derive

9. ### Papabravo Expert

Feb 24, 2006
10,340
1,850
I think the last response was more than a little bit stiff. Specifically, if you knew what you were doing you would know what to look for.

There is a pair of functions called:
Code ( (Unknown Language)):
1.
2. RECTANGULAR_TO_POLAR(x,y)
3. and
4. POLAR_TO_RECTANGULAR(r,θ)
5.
that perform the indicated operations.

All I did was download the program (derive 6.1) and search the help file until I found what you were looking for. Are you trying to tell us you could not have done the same thing?

You can also use the functions:
Code ( (Unknown Language)):
1.
2. abs(z)  to compute the magnitude of z
3.
4. and
5.
6. phase(z) to compute the principal angle of z
7.

Last edited: May 1, 2012