eval.save

eval.save is an R package that supports simple disk caching of expression evaluations.

Below is an example:

library(eval.save)
eval.save.dir(".save")

## [1] ".save"

f <- function(i) i*i
x <- eval.save(f(3), "f")

## Wed Apr  5 16:59:57 2017 Evaluating .save/f.rda ...
## Wed Apr  5 16:59:57 2017  done.

print(x)

## [1] 9

y <- eval.save(f(4), "g")

## Wed Apr  5 16:59:57 2017 Evaluating .save/g.rda ...
## Wed Apr  5 16:59:57 2017  done.

print(y)

## [1] 16

eval.saved("f")

## [1] TRUE

eval.saved("g")

## [1] TRUE

eval.ret("f")

## [1] 9

eval.ret("g")

## [1] 16

f(5)

## [1] 25

z <- eval.save(f(5), "f")
print(z)

## [1] 9

eval.ret("f")

## [1] 9

eval.saved("h")

## [1] FALSE

z <- eval.save(f(5), "h")

## Wed Apr  5 16:59:57 2017 Evaluating .save/h.rda ...
## Wed Apr  5 16:59:57 2017  done.

print(z)

## [1] 25

eval.ret("h")

## [1] 25