R help - Oct 2010 - R shp(ESRI) point patterns and marks

I have a point dataset (ESRI shp file)
each point has an associated weight (grams)
These are the weights of animal bones recovered from an archaeological
excavation
I am trying to import the shp file and then do a density plot of the weight
data, so:

#Import shp file
library(spatstat)
library(maptools)
library(sp)

S <- readShapePoints("flint.shp")
SP <- as(S, "SpatialPoints")
P <- as(SP, "ppp")

So that brings in the shp file but I want to assign the marks(m) so I can do
something like:

plot(density(P, 10))

But based on the weights (grams (not spatial weighting))

Can anyone help?

Thanks

Gary
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All fixed:

I scaned in the data from x.txt and y.txt

then:

P<-ppp(x,y,c(...),c(...), marks=m)


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