I ran this script in a source file on my Mac:

library(lattice)
year <- 1900:2000
dollars <- (year-1899)^2
plot(year,dollars)
quartz("year")
histogram(~dollars)

The first plot appears in Quartz 2. The second quartz window, named year, opens but the histogram doesn't appear. 

However, when I copy and paste this script directly into the R console, both quartz windows (Quartz 2 and year) open and both plots appear.

As a counter example, the script below run as a source file, works as expected, and I get two plots in two windows:

library(lattice)
year <- 1900:2000
dollars <- (year-1899)^2
plot(year,dollars)
quartz("year")
plot(year, dollars)

How do I get the lattice package to generate multiple plots in multiple windows from a script run from a source file?

Thank you ahead of time,

Sarah B.
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