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library("R.cache")
for (kk in 1:5) {
cat(sprintf("Iteration #%d:\n", kk))
res <- evalWithMemoization({
cat("Evaluating expression...")
a <- 1
b <- 2
c <- 4
cat("done\n")
b
})
print(res)
# Sanity checks
stopifnot(a == 1 && b == 2 && c == 4)
# Clean up
rm(list=c("a", "b", "c"))
} # for (kk ...)
############################################################
# WARNING
############################################################
# If the expression being evaluated depends on
# "input" objects, then these must be be specified
# explicitly as "key" objects.
for (ii in 1:2) {
for (kk in 1:3) {
cat(sprintf("Iteration #%d:\n", kk))
res <- evalWithMemoization({
cat("Evaluating expression...")
a <- kk
cat("done\n")
a
}, key=list(kk=kk))
print(res)
# Sanity checks
stopifnot(a == kk)
# Clean up
rm(list=c("a"))
} # for (kk ...)
} # for (ii ...)
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