[R] spatstat sub-selection

[Tom_R]

Fellow Users,

In Spatstat, if you have a ppp object with, say 100 points, how do you
create another ppp containing a random selection, N, of the original?

You can tell the function 'rthin' to make a sub-selection of points, i.e.
"every point is removed with probability 0.5" but you CAN'T set N exactly...

I'm sure this should be easy...

Ta!

Tom
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