pbapply (version 1.7-2)

timerProgressBar: Timer Progress Bar

Description

Text progress bar with timer in the R console.

Usage

timerProgressBar(min = 0, max = 1, initial = 0, char = "=",
    width = NA, title, label, style = 1, file = "", min_time = 0)
getTimerProgressBar(pb)
setTimerProgressBar(pb, value, title = NULL, label = NULL)
getTimeAsString(time)

Value

For timerProgressBar an object of class "timerProgressBar"

inheriting from "txtProgressBar".

For getTimerProgressBar and setTimerProgressBar, a length-one numeric vector giving the previous value (invisibly for setTimerProgressBar).

getTimeAsString returns time in ~HHh MMm SSs format as character. Returns "calculating" when time=NULL.

Arguments

min, max

(finite) numeric values for the extremes of the progress bar. Must have min < max.

initial, value

initial or new value for the progress bar. See Details for what happens with invalid values.

char

he character (or character string) to form the progress bar. If number of characters is >1, it is silently stripped to length 1 unless style is 5 or 6 (see Details).

width

the width of the progress bar, as a multiple of the width of char. If NA, the default, the number of characters is that which fits into getOption("width").

style

the style taking values between 1 and 6. 1: progress bar with elapsed and remaining time, remaining percentage is indicated by spaces between pipes (default for this function), 2: throbber with elapsed and remaining time, 3: progress bar with remaining time printing elapsed time at the end, remaining percentage is indicated by spaces between pipes (default for style option in pboptions), 4: throbber with remaining time printing elapsed time at the end, 5: progress bar with elapsed and remaining time with more flexible styling (see Details and Examples), 6: progress bar with remaining time printing elapsed time at the end with more flexible styling (see Details and Examples).

file

an open connection object or "" which indicates the console.

min_time

numeric, minimum processing time (in seconds) required to show a progress bar.

pb

an object of class "timerProgressBar".

title, label

ignored, for compatibility with other progress bars.

time

numeric of length 1, time in seconds.

Author

Zygmunt Zawadzki <[e-mail]>

Peter Solymos <[e-mail]>

Details

timerProgressBar will display a progress bar on the R console (or a connection) via a text representation.

setTimerProgessBar will update the value. Missing (NA) and out-of-range values of value will be (silently) ignored. (Such values of initial cause the progress bar not to be displayed until a valid value is set.)

The progress bar should be closed when finished with: this outputs the final newline character (see closepb).

If style is 5 or 6, it is possible to define up to 4 characters for the char argument (as a single string) for the left end, elapsed portion, remaining portion, and right end of the progress bar (|= | by default). Remaining portion cannot be the same as the elapsed portion (space is used for remaining in such cases). If 1 character is defined, it is taken for the elapsed portion. If 2-4 characters are defined, those are interpreted in sequence (left and right end being the same when 2-3 characters defined), see Examples.

getTimeAsString converts time in seconds into ~HHh MMm SSs format to be printed by timerProgressBar.

See Also

The timerProgressBar implementation follows closely the code of txtProgressBar.

Examples

## increase sluggishness to admire the progress bar longer
sluggishness <- 0.02

test_fun <- function(...)
{
    pb <- timerProgressBar(...)
    on.exit(close(pb))
    for (i in seq(0, 1, 0.05)) {
        Sys.sleep(sluggishness)
        setTimerProgressBar(pb, i)
    }
    invisible(NULL)
}

## check the different styles
test_fun(width = 35, char = "+", style = 1)
test_fun(style = 2)
test_fun(width = 50, char = ".", style = 3)
test_fun(style = 4)
test_fun(width = 35, char = "[=-]", style = 5)
test_fun(width = 50, char = "{*.}", style = 6)

## no bar only percent and elapsed
test_fun(width = 0, char = "    ", style = 6)

## this should produce a progress bar based on min_time
(elapsed <- system.time(test_fun(width = 35, min_time = 0))["elapsed"])
## this should not produce a progress bar based on min_time
system.time(test_fun(min_time = 2 * elapsed))["elapsed"]

## time formatting
getTimeAsString(NULL)
getTimeAsString(15)
getTimeAsString(65)
getTimeAsString(6005)

## example usage of getTimeAsString, use sluggishness <- 1
n <- 10
t0 <- proc.time()[3]
ETA <- NULL
for (i in seq_len(n)) {
    cat(i, "/", n, "- ETA:", getTimeAsString(ETA))
    flush.console()
    Sys.sleep(sluggishness)
    dt <- proc.time()[3] - t0
    cat(" - elapsed:", getTimeAsString(dt), "\n")
    ETA <- (n - i) * dt / i
}