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#1 2012-10-21 16:51:25

Wink
Guest

Signum function

What will be sgn(a+bi)?

#2 2012-10-21 17:21:44

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 87,249

Re: Signum function

Hi Wink;


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

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#3 2012-10-21 17:56:11

Wink
Guest

Re: Signum function

Is the csgn(x) function related to sgn(x)?

#4 2012-10-22 00:08:33

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 87,249

Re: Signum function

Hi;

The csgn function is defined like this:


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Offline

#5 2012-10-22 01:59:38

Wink
Guest

Re: Signum function

If I want to find sign of complex number what should I use, sgn(z) or csgn(z)

#6 2012-10-22 03:36:21

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 87,249

Re: Signum function

Hi;

I would use the sgn(z).


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Offline

#7 2012-10-22 03:38:28

Wink
Guest

Re: Signum function

Then what is csgn for?

#8 2012-10-22 03:42:33

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 87,249

Re: Signum function

Hi;

The guys at Waterloo say:

The csgn function is used to determine in which half-plane ("left" or "right") the complex-valued expression or number x lies.


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Offline

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