HP 50G Entering Numbers in Polar Form (7989 Views)
Posts: 14
Registered: ‎11-18-2010
Message 1 of 21 (7,989 Views)

# HP 50G Entering Numbers in Polar Form

Hello, I am having a problem with entering numbers in polar form. Specifically with entering the angle in radians. I can enter say, 160<45 degrees. What I need to do is enter this as 160<pi/4. The calculator won''t let me use a variable with pi/4 stored in it as the angle either. Does anyone have a solution to this problem? I can't find any answers in the User's Guide.

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Posts: 2,392
Registered: ‎02-09-2009
Message 2 of 21 (7,952 Views)

# Re: HP 50G Entering Numbers in Polar Form

Hi, bastiat:

Try, with change in ...

CALCULATOR MODES:

Number Format ... Std

Angle Measure ... Degress

Coord System ... Polar

SYSTEM FLAGS:

03 Function -> symb

Best Regards.

MACH.:smileyhappy:

Honored Contributor
Posts: 2,392
Registered: ‎02-09-2009
Message 3 of 21 (7,951 Views)

# Re: HP 50G Entering Numbers in Polar Form

Hi!, bastiat:

You can write in RPN ...

1: '160<PI/4'

Note: PI, is graphical symbol and you can write with ... white left shift arroy key + SPC key.

Best Regards.

MACH.:smileyhappy:

Posts: 14
Registered: ‎11-18-2010
Message 4 of 21 (7,927 Views)

# Re: HP 50G Entering Numbers in Polar Form

Thanks but this still doesn't work. Here are my keystrokes:

LSHIFT  -   160   SPC   ALPHA   RSHIFT   6   LSHIFT   SPC   When PI is entered I get an error.

If I do it this way:

160 ALPH RSHIFT 6 LSHIFT SPC      I have the same problem.

Should I use something else for the angle symbol? I use ALPH RSHIFT 6.

Honored Contributor
Posts: 2,392
Registered: ‎02-09-2009
Message 5 of 21 (7,923 Views)

# Re: HP 50G Entering Numbers in Polar Form

Hi!, bastiat:

You must configure FLAGS ...

03 Function -> num

105 Exact mode on

Too, CALCULATOR MODES

Coord System...... Rectangular

1: '(160,<PI symbol>/4)'

Now, press MODE (H) key.

Change in Coord System ...... Rectangular by POLAR

Now, you can see ...

1: 160.+<symbol PI>/4*i

Now, press EVAL (N) key

Confirm YES, in Complex mode

You must see ...

1: (160.0019227645, <angle symbol> 4.90869909529E-3)

Best Regards.

MACH.:smileyhappy:

Posts: 14
Registered: ‎11-18-2010
Message 6 of 21 (7,919 Views)

# Re: HP 50G Entering Numbers in Polar Form

You must see ...

1: (160.0019227645, <angle symbol> 4.90869909529E-3)

This isn't  what I want. The angle should be 0.78539.

I don't want pi/4 to be the imaginary part of a complex number, I want to enter the radius and angle of the complex number in polar form.  Pi/4 is the angle.

I just want to enter 160<angle>pi/4.

Trusted Contributor
Posts: 110
Registered: ‎03-11-2010
Message 7 of 21 (7,899 Views)

# Re: HP 50G Entering Numbers in Polar Form

Hi, and welcome to the forum.

The 50G won't accept complex numbers in polar form with exact form arguments.  You would have to first convert

pi/4 to decimal form by using the -->NUM command (over the ENTER key) , then assemble it into your polar form.

You can use exact numbers in rectangular form only by using a+bi method (not (a, b)).  You can convert a decimal complex number (polar or rectangular form) to exact rectangular form a+bi, by using the Qpi command.

The -->NUM command will put back to decimal form (rectangular or polar, depending on what the calculator is set to.  You could use the following very short program to extract the argument from a complex number and convert it to exact form:  << DUP  ARG  ->Qpi >>.

Hope this helps,

Best regards, Hal

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Posts: 2,392
Registered: ‎02-09-2009
Message 8 of 21 (7,896 Views)

# Re: HP 50G Entering Numbers in Polar Form

Hi!, bastiat:

IMHO, you can write ...

1: '160,+<PI symbol>/4,*i

You must configurate you HP50G ...

03 Function -> num

XYZ (Coord System ... Rectangular)

C~ (Complex on)

Now, press EVAL (N) key and see ...

1: (160,; ,785398163398)

Best Regards.

MACH.:smileyhappy:

Posts: 14
Registered: ‎11-18-2010
Message 9 of 21 (7,893 Views)

# Re: HP 50G Entering Numbers in Polar Form

The 50G won't accept complex numbers in polar form with exact form arguments.

That's what I was afraid of. I was hoping I could just enter something like 36*Pi/37 as the polar angle without first having to compute the decimel form of it, memorize as many digits as I can, then type it back in as the angle. Kind of defeats the purpose of having a radian mode when you can't type in an exact radian angle. I''m not that worried about exactness, I just want to type it in once instead of doing a bunch of conversions. This calculator is ungainly.

Posts: 14
Registered: ‎11-18-2010
Message 10 of 21 (7,892 Views)

# Re: HP 50G Entering Numbers in Polar Form

I don't want pi/4 as the imaginary part of a complex number. I want pi/4 as the angle in the polar form of a complex number.
Honored Contributor
Posts: 2,392
Registered: ‎02-09-2009
Message 11 of 21 (7,281 Views)

# Re: HP 50G Entering Numbers in Polar Form

Hi!,  bastiat:

Look this solution ...

Configure in you HP50G ...

CAS MODES:

Confirm Approx

Confirm Complex

CALCULATOR MODES:

Coord System ... Polar

1: '(160, <angle symbol><PI symbol/4)' and press ENTER

You must see ...

1: 160.*COS(PI/4)+160.*SIN(PI/4).i

Now, press EVAL (N) key and you can see ...

1: (160., <angle symbol>.785398163397)

Best Regards.

MACH.:smileyhappy:

Posts: 14
Registered: ‎11-18-2010
Message 12 of 21 (7,272 Views)

# Re: HP 50G Entering Numbers in Polar Form

Yes! Thank you! That will do it. It even works without setting the CAS modes to Approx.

It must be that combination of the comma AND angle sign. Thank you for figuring this out for me.

Trusted Contributor
Posts: 110
Registered: ‎03-11-2010
Message 13 of 21 (7,251 Views)

# Re: HP 50G Entering Numbers in Polar Form

bastiat wrote:

That's what I was afraid of. I was hoping I could just enter something like 36*Pi/37 as the polar angle without first having to compute the decimel form of it, memorize as many digits as I can, then type it back in as the angle.

You should never, ever have to retype anything with a 50G.  If you are using the calculator in RPN mode, it's ability to manipulate and compose/decompose numbers, objects and lists is without equal (and anything but ungainly).

Do this:

Be sure you are in RPN mode.

Hit MODE and make sure you're in polar.

Make sure flags 19 and 117 are checked.

Call up the vector control menu by hitting left shift, MTH, then the VECTR softkey (F1).

now you can enter your complex number in polar form like this:

Key in the magnitude and hit enter.

Key in the angle in exact form (ie 36 pi/37 or whatever).

Hit right shift, ENTER to convert the angle to decimal form.

Hit the ->V2 menu key (F5) to compose the numbers into a complex polar number.

Note that  V-> (F4) will decompose the complex number back into levels 1 and 2 of the stack.

Bottom line:  once you get the vector menu up, you can enter complex numbers with only 4 keystrokes (plus your numbers).

Best regards, Hal

Posts: 14
Registered: ‎11-18-2010
Message 14 of 21 (7,235 Views)

# Re: HP 50G Entering Numbers in Polar Form

Thank you! That works too.  How did you guys learn all this stuff? I could not find it in the manual.

Honored Contributor
Posts: 2,392
Registered: ‎02-09-2009
Message 15 of 21 (7,230 Views)

# Re: HP 50G Entering Numbers in Polar Form

Hi!, bastiat:

You can learn the use of HP50G, with the Quick Start Guide, from the attachment clip and too the Quick Reference Guides, from ... http://adorio-research.org/wordpress/?p=453

Best Regards.

MACH.:smileyhappy:

Posts: 14
Registered: ‎11-18-2010
Message 16 of 21 (7,200 Views)

# Re: HP 50G Entering Numbers in Polar Form

Thank you. I have this manual as well as the 900 page one. I couldn't find the answer to my question in either manual.

Esteemed Contributor
Posts: 431
Registered: ‎02-04-2010
Message 17 of 21 (7,185 Views)

# Re: HP 50G Entering Numbers in Polar Form

bastiat wrote:

Thank you! That works too.  How did you guys learn all this stuff? I could not find it in the manual.

By playing around with it. These guys have decades of experience with HP calculators. Just try things, and see what works and what doesn't. If something doesn't quite work the way you want, try writing a program for it (see Programming in User RPL).  Of course forums like these are are a valuable resource too.

Happy calculating.

Bart

Honored Contributor
Posts: 2,392
Registered: ‎02-09-2009
Message 18 of 21 (7,181 Views)

# Re: HP 50G Entering Numbers in Polar Form

Hi!, bastiat:

To be honest, having a HP is a great challenge. This leads to having to overcome obstacles and many hours of dedication. If it's comparison, is like preparing for a long-winded walking competition.
What you should know is that this site will find all necessary aid, but sometimes not satisfy you, because each user has a profile of knowledge and apply it to their work, study, etc ... and not always interpreted properly.
Sound advice: Read all available information in tutorials, guides and newsletters that you find of this little wonder, so-called calculator. In the Eric Rechlin Web site (www.hpcalc.org), you can find the UsrRPL Tutorial from Eduardo Kalinowski and one file call ... One Minute Marvels, for learn.

Do not hesitate to say that today is the best existing microcomputer around the world.
I have some years behind HP (hp67; HP41CV; HP28C; HP75C; HP48G +; HP49G and HP50G) and am still learning.

Best Regards.

MACH.:smileyhappy:

Posts: 102
Registered: ‎03-17-2008
Message 19 of 21 (7,160 Views)

# Re: HP 50G Entering Numbers in Polar Form

I completely agree with Miguel. I am a relative beginner with the HP50g, and I have found it almost impossible to learn to use it from the manual. This forum has been excellent. Miguel, along with Hal and some others give excellent advice. I would not have been able to use my calculator without all the help I have received from this forum.

The HP50g is an excellent calculator. The learning curve is high. It is usually very difficult to learn to do something with the HP50g. But, I have found, once I learn how it works, the HP50g works well, and far better than its competitors.

I always hope to answer a question on here, rather than just ask. Thank you everyone for all of your help.

Trusted Contributor
Posts: 110
Registered: ‎03-11-2010
Message 20 of 21 (7,137 Views)

# Re: HP 50G Entering Numbers in Polar Form

The main problem with the manual is that it switches arbitrarily back and forth between algebraic and RPN.

Hp needs to divide the manual into two distinct sections (algebraic and RPN), or better yet, discard all reference to algebraic!

Honored Contributor
Posts: 2,392
Registered: ‎02-09-2009
Message 21 of 21 (6,800 Views)

# Re: HP 50G Entering Numbers in Polar Form

Hi!, Hal:
IMHO, HP is right to make, alternative examples and solutions exchanged between algebraic and RPN mode, in Tutorials, Manuals and Guides, as they are condensed to every user.
To learn how to use algebraic and UsrRPL, there is a Quick Start Guide, which attached to the clip.

Best Regards.

MACH.:smileyhappy:

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