Early in the ads for .NET 4.0, there were rumours about two types dealing with numeric stuff, BigInteger and Complex. In the Beta 1 phase, BigInteger has appeared (I’ve briefly blogged about it), but Complex was nowhere to be found.
With the advent of .NET 4.0 Beta 2, I was happy to find the emergence of the Complex type in the System.Numerics namespace (and these numeric types have been moved to their own System.Numerics.Dll assembly).
One mishap, I believe, is the existence of a Magnitude property, returning the length of the complex number as measured from the origin, but no MagnitudeSquared property, which is an optimization – as sometimes this is what is needed and the overhead of performing a square root for the Magnitude property is unnecessary (Magnitude is calculated with the super famous pythagorean theorem, requiring a costly square root operation).
Hopefully, this property will be added in the .NET 4.0 RTM.