[R] R facets including two kinds of charts

[Rui Barradas]

Hello,

I hadn't understood the problem, sorry.
The problem are the bar plots, ggplot is plotting one in the "A" facet. 
And since there is nothing to plot, the bars start at 0.

A hack is to plot facet "A" separately and then combine the plots with 
one of several ways to combine ggplot plots. Below is an example with 
cowplot::plot_grid


library(ggplot2)
library(dplyr)
library(cowplot)

p1 <- df %>%
   filter(nm == "A") %>%
   ggplot(aes(x = date)) +
   geom_line(aes(y = val2)) +
   facet_wrap(~ nm, scales = "free_y") +
   theme(plot.margin = unit(c(0.2, 0, 0.1, 0), "cm"))

p2 <- df %>%
   filter(nm != "A") %>%
   ggplot(aes(x = date)) +
   geom_col(aes(y = val0), na.rm = TRUE, fill = "white") +
   geom_line(aes(y = val1)) +
   ylab("") +
   facet_wrap(~ nm, scales = "free_y")

plot_grid(p1, p2, rel_widths = c(1, 2))


Hope this helps,

Rui Barradas



Às 20:10 de 01/08/2024, phil using philipsmith.ca escreveu:
> Thanks for the suggestion, but this does not give me what I want. Each 
> chart needs its own unique scale on the y-axis.
> 
> Philip
> 
> 
> On 2024-08-01 15:08, Rui Barradas wrote:
>> 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
>>>
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>>> 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


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