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Last data update: 2014.03.03
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R: Modify the arguments of a call.
| call_modify | R Documentation |
Modify the arguments of a call.
Description
Modify the arguments of a call.
Usage
call_modify(call, new_args, env = parent.frame())
call_standardise(call, env = parent.frame())
Arguments
call |
A call to modify. It is first standardised with
call_standardise.
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new_args |
A named list of expressions (constants, names or calls)
used to modify the call. Use NULL to remove arguments.
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env |
Environment in which to look up call value.
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Examples
call <- quote(mean(x, na.rm = TRUE))
call_standardise(call)
# Modify an existing argument
call_modify(call, list(na.rm = FALSE))
call_modify(call, list(x = quote(y)))
# Remove an argument
call_modify(call, list(na.rm = NULL))
# Add a new argument
call_modify(call, list(trim = 0.1))
# Add an explicit missing argument
call_modify(call, list(na.rm = quote(expr = )))
Results
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providing 
.