[R] R facets including two kinds of charts

[Rui Barradas]

Às 19:01 de 01/08/2024, phil using philipsmith.ca escreveu:
> I am asking for help with a ggplot2 program that has facets. There are 
> actually 100 facets in my program, but in the example below I have 
> limited the number to 3. There are two kinds of charts among the facets. 
> One kind is a simple line plot with all of the y-values greater than 
> zero. The facet for "A" in my example below is this kind. The other kind 
> is a line plot combined with a bar chart with some of the y-values being 
> positive and others negative. The facets for "B" and "C" in my example 
> are this kind.
> 
> The facets for "B" and "C" look the way I want them to. However the 
> facet for "A" has a scale on the y-axis that starts at zero, whereas I 
> would like the minimum value on this scale to be non-zero, chosen by 
> ggplot2 to be closer to the minimum value of y for that particular facet.
> 
> My example may not be the most efficient way to achieve this, but it 
> works except for one aspect. Chart A, for which I do not wish to show a 
> zero line, does indeed not show a zero line but it nevertheless chooses 
> a scale for the y-axis that has a minimum value of zero. How can I 
> adjust the code so that it chooses a minimum value on the y-axis that is 
> non-zero and closer to the minimum actual y-value (as would be the case 
> for a simple line chart alone, without any facets)?
> 
> library(ggplot2)
> library(dplyr)
> 
> df <- data.frame(
>    date=c(1,1,1,2,2,2,3,3,3,4,4,4,5,5,5,6,6,6),
> nm=c("A","B","C","A","B","C","A","B","C","A","B","C","A","B","C","A","B","C"),
>    val0=c(NA,-5,4,NA,-3,3,NA,2,4,NA,3,3,NA,3,1,NA,-3,-4),
>    val1=c(NA,-3,6,NA,-1,4,NA,5,5,NA,7,2,NA,4,3,NA,-2,-2),
>    val2=c(50,NA,NA,53,NA,NA,62,NA,NA,56,NA,NA,54,NA,NA,61,NA,NA),
>    zline=c(NA,0,0,NA,0,0,NA,0,0,NA,0,0,NA,0,0,NA,0,0)
> )
> 
> ggplot(df)+
>    geom_col(aes(x=date,y=val0),na.rm=TRUE,fill="white")+
>    geom_line(aes(x=date,y=val1))+
>    geom_line(aes(x=date,y=val2))+
>    geom_hline(aes(yintercept=zline),na.rm=TRUE)+
>    facet_wrap(~nm,scales="free_y")
> 
> Thank you for your assistance.
> 
> Philip
> 
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
Hello,

Try to remove

scales="free_y"

from facet_wrap(). With scales="free_y" each facet will have its own y 
limits, given by the data plotted in each of them. If you want a global 
y limits, don't use it.

Hope this helps,

Rui Barradas




-- 
Este e-mail foi analisado pelo software antivírus AVG para verificar a presença de vírus.
www.avg.com