[R] Changing the Y graph scale Maximum value.

[Sundar Dorai-Raj]

John Fisler wrote:

> Hello,
> 
> I am new to R and have read the documents related to graphics but have 
> not come across a description of how to change the maximum scale on a 
> graph.  Below is sample code that sets up a plot window with a 0 Minimum 
> to 10 Maximum, X and Y coordinate system:
> 
> x <- c(1,2,3,4,5,6,7,8,9,10)
> y <- c(1,1.5,2,2.5,3,3.5,4,4.5,5,5.5)
> plot(0:10, 0:10, type = "n" )# setting up coord. system
> points(x, y, col = "red", cex = 1.5)
> 
> I now want to change the maximum Y axis scale to 6.  I am using the 
> 'points' function to plot 'x' and 'y' because my 'real' data is X and Y 
> coordinate based.  When I try to change the maximum Y scale to 6 as in 
> the following code segment, I get the following error:
> 
> plot(0:10, 0:6, type = "n" )# setting up coord. system
> Error in xy.coords(x, y, xlabel, ylabel, log) :
>         x and y lengths differ
> 
> How do I change the maximum Y scale to 6?
> 
> Thanks,
> 
> John Fisler
> 

You should use ylim.

plot(0, 0, type = "n", xlim = c(0, 10), ylim = c(0, 6))

--sundar