[R] Dont show zero values in line graph

Uwe Ligges ligges at statistik.tu-dortmund.de
Fri Jan 7 14:10:08 CET 2011

On 07.01.2011 04:10, LCOG1 wrote:
> Hey everyone,
>     Im getting better at plotting my data but cant for the life of me figure
> out how to show a line graph with missing data that doesnt continue the line
> down to zero then back up to the remaining values.
> Consider the following
> x<-c(1:5,0,0,8:10)
> y<-1:10
> plot(0,0,xlim=c(0,10), ylim=c(0,10),type="n",main="Dont show the bloody 0
> values!!")
> lines(x~y, col="blue", lwd=2,)
> My data is missing the 6th and 7th values and they come in as NA's so i
> change them to 0s but then the plot has these ugly lines that dive toward
> the x axis then back up.  I would do bar plots but i need to show multiple
> sets of data on the same and side by side bars doesnt do it for me.
> So i need a line graph that starts and stops where 0s or missing values
> exist.  Thoughts?

If I understand correctly what you are going to do: Just do not change 
the NAs to zero in advance. NAs are not printed.

Uwe Ligges

> JR

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