[R] Plotting compound functions--help with defining x-axis as f(x)

Uwe Ligges ligges at statistik.tu-dortmund.de
Sun Jul 24 17:52:46 CEST 2011

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On 23.07.2011 00:50, Aimee Jones wrote:
> Hi all,
> I'm having trouble locating a script that will allow to me to create graphs
> that show compound functions as a function of the simple function, rather
> than just x (or time as it is in my case).
>
> Currently I have the following functions defined in my script:
>
>>
>>
>> T1<-function(t) {27.5-12.5*cos(2*pi*t/365)**}

This is not syntactically correct. Perhaps some leftovers of your html
message. The posting guide asks you *not* to send html mail!

>> and
>>
>> B1<-function(T1,t) {dnorm(T1(t),mean=22.5,sd=**3.3)}
>>
>
>
>
> plot(function(t) {B1(T1,t)}, 0, 365) plots B1 as a function of time, whereas
> I am looking for a code that allows me to plot B1 as a function of T1. I
> tried plot(function(T1(t) {B1(T1,t)}, 0, 365) and also plot(function(T1,t)
> {B1(T1,t)}, 0, 365), neither of which worked. My coding skills are very
> limited, and I'm somewhat out of ideas..

So you probably want something along the lines:

t <- seq(0, 365, length=1000)
plot(T1(t), B1(T1, t), type="l")

Uwe Ligges

>
> Thank you for any assistance you are able to give,
> yours sincerely,
> Aimee
>
> ps: If it's relevant I'm using R64 (R 2.11.1) on a Mac
>
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>
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