# [R] DEfining and plotting the sum of two functions

Berend Hasselman bhh at xs4all.nl
Mon May 20 15:49:57 CEST 2013

```On 20-05-2013, at 14:09, Honest Chipoyera <Honest.Chipoyera at wits.ac.za> wrote:

> I have two functions H1(x) and H2(x) defined separately and I wish to create a new function H(x)  which is the sum of the two functions. I also need to plot the three functions using the command "curve". With the aid of the example program below, can you please explain how I can do that in R.
>
> H1<-function(x) x^2
> H2<-function(x) x+5
> H<-function(x){H1+H2}
> par(mfrow=c(3,1))
> curve(H1(x),0,100)
> curve(H2(x),0,100)
> curve(H(x),0,100)

You correctly use H1(x) and H2(x) in the curve calls.
Why don't you use H1(x)+H2(x) in function H?

H<-function(x){H1(x)+H2(x)}

Berend

>
> HW Chipoyera
> Cell: 0767190507

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