Performance of DescriptiveStatistics is questionable about mathnet-numerics

[tibel]

Why not change DescriptiveStatistics.Median to:

public double Median
{
    get { return _medianLazy.Value; }
}

readonly Lazy<double> _medianLazy;

And in constructor call:

_medianLazy = new Lazy<double>(() => data.Median());

This way Median is only calculated on first access to Median property and not in constructor. This would make DescriptiveStatistics much faster.

Or you remove Median from DescriptiveStatistics now. It is deprecated already.

[cdrnet]

My plan so far is to remove Median on the next major release (together with all other deprecated code) when we can "officially" break compatibility according to semver.

Although the lazy approach would be a good idea in the meantime!

[tibel]

I have send a pull request with the lazy approach. Then I think this issue can be closed.

[cdrnet]

Thanks!