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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
From: Bumpkinland
Registered: 2009-04-12
Posts: 107,190

### Re: Signum function

Hi Wink;

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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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
From: Bumpkinland
Registered: 2009-04-12
Posts: 107,190

### Re: Signum function

Hi;

The csgn function is defined like this:

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #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
From: Bumpkinland
Registered: 2009-04-12
Posts: 107,190

### Re: Signum function

Hi;

I would use the sgn(z).

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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
From: Bumpkinland
Registered: 2009-04-12
Posts: 107,190

### 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.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline