R help - Sep 2016 - Apply a multi-variable function to a vector

Hello,



I would like to define an arbitrary function of an arbitrary number of
variables, for example, for 2 variables:



func2 <- function(time, temp) time + temp



I'd like to keep variable names that have a meaning in the problem (time
and temperature above).



If I have a vector of values for these variables, for example in the 2-d
case, c(10, 121), I'd like to apply my function (in this case func2) and
obtain the result. Conceptually, something like,



func2(c(10,121))



becomes



func2(10,121)



Is there a simple way to accomplish this, for an arbitrary number of
variables?  I?d like something that would simply work from the definition
of the function.  If that is possible.



Thanks,



Steve Kennedy

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Try do.call(), as in
> func2 <- function(time, temp) paste(time, temp)
> func2(121, 10)
[1] "121 10"
> do.call(func2, as.list(c(121,10)))
[1] "121 10"
> do.call(func2, list(121,10))
[1] "121 10"
>
> func2(121, time=10:12)
[1] "10 121" "11 121" "12
121"
> do.call(func2, list(121,time=10:12))
[1] "10 121" "11 121" "12 121"


Bill Dunlap
TIBCO Software
wdunlap tibco.com

On Fri, Sep 9, 2016 at 12:50 PM, Stephen Kennedy <stevek9123 at gmail.com>
wrote:
> Hello,
>
>
>
> I would like to define an arbitrary function of an arbitrary number of
> variables, for example, for 2 variables:
>
>
>
> func2 <- function(time, temp) time + temp
>
>
>
> I'd like to keep variable names that have a meaning in the problem
(time
> and temperature above).
>
>
>
> If I have a vector of values for these variables, for example in the 2-d
> case, c(10, 121), I'd like to apply my function (in this case func2)
and
> obtain the result. Conceptually, something like,
>
>
>
> func2(c(10,121))
>
>
>
> becomes
>
>
>
> func2(10,121)
>
>
>
> Is there a simple way to accomplish this, for an arbitrary number of
> variables?  I?d like something that would simply work from the definition
> of the function.  If that is possible.
>
>
>
> Thanks,
>
>
>
> Steve Kennedy
>
>         [[alternative HTML version deleted]]
>
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