Prints Progress Reports during a loop or iterative calculation.

```
progressreport(i, n,
every = min(100,max(1, ceiling(n/100))),
tick = 1,
nperline = NULL,
charsperline = getOption("width"),
style = spatstat.options("progress"),
showtime = NULL,
state=NULL)
```

i

Integer. The current iteration number (from 1 to `n`

).

n

Integer. The (maximum) number of iterations to be computed.

every

Optional integer. Iteration number will be printed
when `i`

is a multiple of `every`

.

tick

Optional integer. A tick mark or dot will be printed
when `i`

is a multiple of `tick`

.

nperline

Optional integer. Number of iterations per line of output.

charsperline

Optional integer. The number of characters in a line of output.

style

Character string determining the style of display.
Options are `"tty"`

(the default), `"tk"`

and `"txtbar"`

.
See Details.

showtime

Optional. Logical value indicating whether to print the estimated
time remaining. Applies only when `style="tty"`

.

state

Optional. A list containing the internal data.

If `state`

was `NULL`

, the result is `NULL`

.
Otherwise the result is the updated value of `state`

.

This is a convenient function for reporting progress during an iterative sequence of calculations or a suite of simulations.

If

`style="tk"`

then`tcltk::tkProgressBar`

is used to pop-up a new graphics window showing a progress bar. This requires the package tcltk. As`i`

increases from 1 to`n`

, the bar will lengthen. The arguments`every, tick, nperline, showtime`

are ignored.If

`style="txtbar"`

then`txtProgressBar`

is used to represent progress as a bar made of text characters in the R interpreter window. As`i`

increases from 1 to`n`

, the bar will lengthen. The arguments`every, tick, nperline, showtime`

are ignored.If

`style="tty"`

(the default), then progress reports are printed to the console. This only seems to work well under Linux. As`i`

increases from 1 to`n`

, the output will be a sequence of dots (one dot for every`tick`

iterations), iteration numbers (printed when iteration number is a multiple of`every`

or is less than 4), and optionally the estimated time remaining. For example`[etd 1:20:05]`

means an estimated time of 1 hour, 20 minutes and 5 seconds until finished.The estimated time remaining will be printed only if

`style="tty"`

, and the argument`state`

is given, and either`showtime=TRUE`

, or`showtime=NULL`

and the iterations are slow (defined as: the estimated time remaining is longer than 3 minutes, or the average time per iteration is longer than 20 seconds).

It is optional, but strongly advisable, to use the argument `state`

to store and update the internal data for the progress reports
(such as the cumulative time taken for computation)
as shown in the last example below.
This avoids conflicts with other programs that might be
calling `progressreport`

at the same time.

```
# NOT RUN {
for(i in 1:40) {
#
# code that does something...
#
progressreport(i, 40)
}
# saving internal state: *recommended*
sta <- list()
for(i in 1:20) {
# some code ...
sta <- progressreport(i, 20, state=sta)
}
# }
```

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