Logger initialization

Generates a fairly flexible container to log stuff.

log_init(what, init.size, at = NULL, to = NULL)

Arguments

what	[named(character)] Named character vector. The names (i.e., names(what)) describe which elements we want to log and the actual values represent the types/modes these values are stored as. Possible values are “integer”, “numeric”, “character”, “logical” for the respective scalar atomic values, or “list” for any other complex R objects, e.g., matrices, lists etc. Note that internally c("iter" = "numeric") is attached automatically and iter must be passed to log_update in subsequent calls.
init.size	[integer(1)] Initial size of the log.
at	[integer] Optional integer vector of times when logging should take place. If the iteration counter is in at, the state is logged, otherwise it is not.
to	[character(1)] File path to log-directory. If not NULL, each call to log_update stores the serialized state in file “<to>/<iteration>.rds”.

Value

Logger environment.

See also

log_update

Examples

log = log_init(c("P" = "list", "f" = "list", "C" = "character"),
  init.size = 5L, at = c(1, 3))

# Note that div is not subject to logging since it was not specified in log_init
log_update(log, P = matrix(runif(10), ncol = 2L), C = "a",
  f = runif(10), iter = 1, div = letters[1:3])
log_update(log, P = matrix(runif(10), ncol = 2L), C = "b",
  f = runif(10), iter = 2, div = letters[1:3])
log_update(log, P = matrix(runif(10), ncol = 2L), C = "a",
  f = runif(10), iter = 3, div = letters[1:3])
print(log$df)
#>   iter            P            f C
#> 1    1 0.600760.... 0.034241.... a
#> 2    3 0.641679.... 0.174675.... a
#> 3    0                            
#> 4    0                            
#> 5    0