# [R] How to use curve() function without using x as the variable name inside expression?

C W tmrsg11 at gmail.com
Fri Jan 30 04:34:05 CET 2015

```Hi Bill,

You solved by problem.  For some reason, I thought xname was only referring
to name of the x-axis.

I remember last time I fixed it, it was something about xname, couldn't get
it right this time.

Thanks!  Saved me hours from frustration.

Mike

On Thu, Jan 29, 2015 at 9:04 PM, William Dunlap <wdunlap at tibco.com> wrote:

> Does
>    help(curve)
> talk about its 'xname' argument?
>
> Try
>    curve(10*foofoo, from=0, to=17, xname="foofoo")
>
> You will have to modify your function, since curve() will
> call it once with a long vector for the independent variable
> and func(rnorm(10), rnorm(10), mu=seq(0,5,len=501)) won't
> work right.
>
>
> Bill Dunlap
> TIBCO Software
> wdunlap tibco.com
>
> On Thu, Jan 29, 2015 at 5:43 PM, C W <tmrsg11 at gmail.com> wrote:
>
>> Hi Rui,
>>
>> Thank you for your help.  That works for now, but eventually, I need to be
>> pass in x and y.
>>
>> Is there a way to tell the curve() function, x is a fix vector, mu is a
>> variable!
>>
>> Thanks,
>>
>> Mike
>>
>> On Thu, Jan 29, 2015 at 5:25 PM, Rui Barradas <ruipbarradas at sapo.pt>
>> wrote:
>>
>> > Hello,
>> >
>> > The following will work, but I don't know if it's what you want. func2
>> > will get x and y from the global environment.
>> >
>> > func2 <- function(mu){
>> >    x + y + mu ^ 2
>> > }
>> >
>> > curve(func2, from = 0, to = 10)
>> >
>> >
>> > Hope this helps,
>> >
>> >
>> > Em 29-01-2015 21:02, C W escreveu:
>> >
>> >> Hi all,
>> >>
>> >> I want to graph a curve as a function of mu, not x.
>> >>
>> >> Here's the R code:
>> >>
>> >> x <- rnorm(10)
>> >> y <- rnorm(10)
>> >>
>> >> func <- function(x, y, mu){
>> >>     x + y + mu ^ 2
>> >> }
>> >>
>> >> curve(f = func(x = x, y = y, mu), from = 0, to = 10)
>> >> I know I can change variable mu to x, but is there a way to tell R
>> that mu
>> >> is the variable of interest, not x.
>> >>
>> >>
>> >> Mike
>> >>
>> >>         [[alternative HTML version deleted]]
>> >>
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>> >>
>> >>
>>
>>         [[alternative HTML version deleted]]
>>
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