[R] Segmentation error

[Suzanne E. Blatt]

Hello,

I'm using library(spatstat) and trying to use ppp on my dataset.  I get a segmentation error when I try to run it.  Any suggestions?  Code below ...

Thanks,
Suzanne
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dat <- read.delim(file="trees_R2.csv", sep=",", header=1)

P16 <- (dat$Plot == "P1") | (dat$Plot == "P2") | (dat$Plot == "P3")
y94 <- dat$Easting[P16]
x94 <- dat$Northing[P16]

library(spatstat)
F194 <- ppp(x94, y94, c(0, 100), c(0, 50))
a <- allstats(F194, dataname="Field 1 - 1994")
plot(a)