CODEWITHSUNDEEP
r
Dennis Guse
Dennis Guse

Reputation: 893

R: wrapper function(fun, parameters) that calls fun with "unrolled" parameters

I would like to implement a generic function:

call_with_parameters <- function(func, parameters) {
    call func with parameters and return result
}

that calls the given function func (given as paramter) with a list of parameters, so func must not be able to cope with generic parameters (like ...). As return the call

For example to call: mean(x=1:4, na.rm=TRUE) as

call_with_parameters(mean, list(x=1:4, na.rm=TRUE))

Any suggestions?

Upvotes: 1

Views: 107

Answers (1)

agstudy
agstudy

Reputation: 121568

I think, you are looking for do.call for the construction of function calls.

The function constructs the call and evaluates it immediately( You can also use call to construct the call and evaluates it later using eval for example). do.call takes the arguments from an object of mode "list" containing all the arguments of function to be evaluated. For example: 

do.call("mean", list(x=1:4,na.rm=TRUE))

is equivalent to : 

mean(x=1:4,na.rm=TRUE)

Upvotes: 3

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