Compare to eval(), evaluate captures all of the
information necessary to recreate the output as if you had copied and pasted
the code into a R terminal. It captures messages, warnings, errors and
output, all correctly interleaved in the order in which they occured. It
stores the final result, whether or not it should be visible, and the
contents of the current graphics device.
evaluate(input, envir = parent.frame(), enclos = NULL, debug = FALSE,
stop_on_error = 0L, keep_warning = TRUE, keep_message = TRUE, new_device = TRUE,
output_handler = default_output_handler, filename = NULL, include_timing = FALSE)input object to be parsed and evaluated. May be a string, file
connection or function. Passed on to parse_all().
environment in which to evaluate expressions.
when envir is a list or data frame, this is treated as
the parent environment to envir.
if TRUE, displays information useful for debugging,
including all output that evaluate captures.
if 2, evaluation will halt on first error and you
will get no results back. If 1, evaluation will stop on first error
without signaling the error, and you will get back all results up to that
point. If 0 will continue running all code, just as if you'd pasted
the code into the command line.
whether to record warnings and messages.
if TRUE, will open a new graphics device and
automatically close it after completion. This prevents evaluation from
interfering with your existing graphics environment.
an instance of output_handler() that
processes the output from the evaluation. The default simply prints the
visible return values.
string overrriding the base::srcfile() filename.
if TRUE, evaluate will wrap each input
expression in system.time(), which will be accessed by following
replay() call to produce timing information for each evaluated
command.