# To make a graph for 4 functions

6 messages
Open this post in threaded view
|
Report Content as Inappropriate

## To make a graph for 4 functions

 lets say I have these function and I want to have a graph on them y0=x^2 y1=x^3 Then I say this x=seq(0,10,length.out=100) plot(x,y0,y1,type="l") but R does not give me a graph. How would you do it?
Open this post in threaded view
|
Report Content as Inappropriate

## Re: To make a graph for 4 functions

 Hello, quantum wrote lets say I have these function and I want to have a graph on them y0=x^2 y1=x^3 Then I say this x=seq(0,10,length.out=100) plot(x,y0,y1,type="l") but R does not give me a graph. How would you do it? First of all, try your own code: > y0=x^2 Error: object 'x' not found Unlike you've said, y0=x^2 is not a function. Functions in R look like this: y0 <- function(x) x^2 y1 <- function(x) x^3 This is chapter 10 of R-intro.pdf, "Writing your own functions". Also, use the help system. ?plot It will tell you that 'plot' plot x against y, not against two variables. plot(x, y0(x), type="l") lines(x, y1(x)) Or, use function 'curve'. curve(x^2, from=0, to=10, col="red") curve(x^3, from=0, to=10, col="blue", add=TRUE) And, please, read the manual above. It WILL save you time. Hope this helps, Rui Barradas
Open this post in threaded view
|
Report Content as Inappropriate

## Re: To make a graph for 4 functions

 In reply to this post by quantum Thanks for your response. Now I have 3 functions for example y0<-function(x) x^2 y1<-function(x) x^3 y2<-function(x) x^5 t<-function(x) c(y0(x),y1(x),y2(x)) I want to plot this so I get 3 graphs in a diagram. How can I do this? plot(x,t(x),type="l") doesnt work.
Open this post in threaded view
|
Report Content as Inappropriate

## Re: To make a graph for 4 functions

 Use curve() like Rui said. Michael On Fri, Apr 27, 2012 at 1:48 PM, quantum <[hidden email]> wrote: > Thanks for your response. > > Now I have 3 functions for example > > y0<-function(x) x^2 > y1<-function(x) x^3 > y2<-function(x) x^5 > > t<-function(x) c(y0(x),y1(x),y2(x)) > > I want to plot this so I get 3 graphs in a diagram. > > How can I do this? > > plot(x,t(x),type="l") doesnt work. > > -- > View this message in context: http://r.789695.n4.nabble.com/To-make-a-graph-for-4-functions-tp4592941p4593316.html> Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > [hidden email] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html> and provide commented, minimal, self-contained, reproducible code. ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.
Open this post in threaded view
|
Report Content as Inappropriate

## Re: To make a graph for 4 functions

 How can I use the curve when I have a vector? How should the R code look like?