Error in ppois function (PR#161)

     ppois(q, lambda)

where q is undefined! It should only be defined for integers. Similarly, x
should only be integers.

Ummmm.  I guess I see the argument for dpois, but I thought the
distribution function was defined for all values.  Wouldn't it be in order
to apply the integer argument function to floor(q) perhaps?

This seems to be what S does.

	> ppois(1.5, 2)
	[1] 0.4060058
	> ppois(1.1, 2)
	[1] 0.4060058


	Ross



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