# [R] Simple Problem: Plotting mathematical functions

David Winsemius dwinsemius at comcast.net
Fri Apr 13 03:11:02 CEST 2012

```On Apr 12, 2012, at 3:49 PM, Aye wrote:

> Okay, i got this far:
> f <- function(x) 0.25*x^2 + 6.47*x -32.6
> g <- function(x) 0.99*x^2 -6*x -195
> h <- function(x) 0.77*x^2 +14*x -495
> j <- function(x) 0.001*x^2 + 65*x -785
> k <- function(x) 0.9*x^2 -2*x -636
> plot(x, f(x), xlab="Elemente in der Reihung", ylab="Indexwert des
> Sortieraufwands"), type="l")
> // lines(x, g(x), lty=3) //Not sure if it works, but this is
> irrelevant atm.
>
> As soon as R does the plot command, he states that x is an object he
> can't
> find.
> So i propably have to do something like x <- XXXXXXXXXX. What do I
> insert
> for the XXXXXXXXX to make it have the values - say - from 15 to 10000?

x <- seq(15, 1000, by=5)

>
> Thanks again.
>
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