beetle2 wrote:
>
> For a homework question.
> I was wondering if rcmdr has a function to plot a graph of a bivariate
> function of X and Y.
> I have a function with joint pdf
>
> fX,Y(x,y) = x+y for 0<x<1 , 0<y<1
>
> I've tried
>> x <- seq(0,1,.001)
>> y <- seq(0,1,.001)
>> r = x+y
>> plot(r)
>
> but it seems to just add them together say .2+.2 .3+.3 not other
> possibilities like
>
> .9 + .1
>
>
We don't do homework questions here, but a few hints:
(1) the question doesn't seem to be fully specified. Are x and y supposed
to be uniform?
(2) you could get a reasonable representation of the solution (although
not necessarily one your prof would be happy with) by adding
runif(10000,0,1) and runif(10000,0,1)
(3) to do this analytically, think about convolutions and/or moment
generating
functions.
Ben Bolker
--
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