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## Re: creating Inf*i

 From: A S Hodel Subject: Re: creating Inf*i Date: Mon, 12 May 2003 09:20:53 -0500

I'd be curious what the IEEE standard for this kind of operation specifies. If you view the complex plane as an honest-to-goodness plane, then what you're saying makes sense. If, on the other hand, you view it as the Riemann sphere, then "all roads lead to infinity" - and there's only one infinity, at the top of the sphere. This latter viewpoint is how one has to interpret a number of control-theoretic results in complex analysis.
```
```
As a result, there may be some ambiguity of what i*inf returns - although, like you, I'd like to see it be 0 + i*inf.
```
On Monday, May 12, 2003, at 04:05 AM, withaar wrote:

```
```Hi all,

```
I need to create an imaginary infinity number. These methods don't work:
```
a = complex(0,Inf)
a = 1i*Inf

```
Both methods multiply (0+i)*Inf and the result is NaN+Infi because 0*Inf
```is undefined. This, however, works:

a = (1i*realmax)*2

Is there a better way to do this?

cheers,

Willem

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```

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