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**Wink****Guest**

What will be sgn(a+bi)?

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,856

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.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**Wink****Guest**

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

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,856

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.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**Wink****Guest**

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

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,856

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.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**Wink****Guest**

Then what is csgn for?

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,856

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.**

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