[R] R facets including two kinds of charts

[phii m@iii@g oii phiiipsmith@c@]

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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> 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