Inline display of progress
These functions provide an inline display of pregress.
initProgInd(leadStr = "..", trailStr = "", quiet = !interactive()) updateProgInd(newFrac, progInd, quiet = !interactive())
leadStr |
character string that will be printed before the actual progress number. |
trailStr |
character string that will be printed after the actual progress number. |
quiet |
can be used to silence the indicator for non-interactive sessions whose output is typically redirected to a file. |
newFrac |
new fraction of progress to be displayed. |
progInd |
an object of class |
A progress indicator is a simple inline display of progress intended to satisfy impatient users during
lengthy operations. The function initProgInd initializes a progress indicator (at zero);
updateProgInd updates it to a specified fraction.
Note that excessive use of updateProgInd may lead to a performance penalty (see examples).
Both functions return an object of class progressIndicator that holds information on the last
printed value and should be used for subsequent updates of the indicator.
Peter Langfelder
max = 10;
prog = initProgInd("Counting: ", "done");
for (c in 1:max)
{
Sys.sleep(0.10);
prog = updateProgInd(c/max, prog);
}
printFlush("");
printFlush("Example 2:");
prog = initProgInd();
for (c in 1:max)
{
Sys.sleep(0.10);
prog = updateProgInd(c/max, prog);
}
printFlush("");
## Example of a significant slowdown:
## Without progress indicator:
system.time( {a = 0; for (i in 1:10000) a = a+i; } )
## With progress indicator, some 50 times slower:
system.time(
{
prog = initProgInd("Counting: ", "done");
a = 0;
for (i in 1:10000)
{
a = a+i;
prog = updateProgInd(i/10000, prog);
}
}
)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.