[R] can I calculate density for only non-negative value?

[Prof Brian Ripley]

On 20/08/2013 03:35, Gallon Li wrote:
>   x=rchisq(100,1)
> density(x)
>
> the density plot will give density for negative part also. of course I can
> truncate the plot to only view the non-negative part.
>
> I wonder if there is a program to compute density for a user-specified
> range, in this case, only [0, infinity).

Yes, but it will not be using the same method as density.  One place to 
look is logspline() in package polspline, but please learn about the 
methodology of density estimation before you use any of these.

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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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