Some variation of this might do it:
tryCatch(for (i in seq_len(1000000)) Sys.sleep(1),
interrupt = function(e) i)
If you want the option to inspect and continue you would need to use
withCallingHandlers and invoke a 'resume' restart.
Best,
luke
On Fri, 10 Sep 2021, Ivan Krylov wrote:
Hello everyone,
I'm writing an R function that may be running for "long" periods of
time (think tens of minutes), and I would like to be able to tell it:
"please stop what you're doing and return the not-yet converged results
as they are for inspection".
The behaviour I'm striving for is
1) User presses interrupt
2) Function handles the interrupt and returns as if the convergence
test passed
3) By some black magic, the interrupt condition is raised on the
previous function call level (to avoid the situation where my
function is called in a loop by some other function and the user
wants to interrupt the whole process, not just my function).
Is this a good idea? Is (3) even possible? (I guess I could check the
length of sys.parents() and avoid recovering from the interrupt if
called from some other function, but that feels dirty.) Could something
similar be achieved with options(error = recover) and R restarts? Are
there other ways of, well, interrupting the execution of R functions
without changing the semantics of interrupts in R?
I've been working with MATLAB lately (when in Rome, do as Romans
do...), and their idiom for my desired behaviour is "create a plot
window and return when that window is closed", but that doesn't
translate well to R.
--
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: luke-tier...@uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
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