[R] disturbed legend in ggplot2

[Ulrik Stervbo]

Hi Troels,

Try to move the size argument out of the aesthetic.

Best wishes,
Ulrik

On Mi., 27. Sep. 2017, 08:51 Troels Ring <tring at gvdnet.dk> wrote:

> Dear friends - below is a subset of a much larger material showing two
> ways of generating two "lines". The intention is to have the colour
> reflect a variable, pH, but the legend is disturbed. The little part
> marked "3" above the colour scale is unwelcome. Why did it appear? How
> could I avoid it?
>
> I'm on Windows 7, R version 3.4.1 (2017-06-30) -- "Single Candle"
>
> All best wishes
>
> Troels Ring
> Aalborg, Denmark
>
> library(ggplot2)
> DF1 <-
> structure(list(P = c(0, 0.00222222222222222, 0.00444444444444444,
> 0.00666666666666667, 0.00888888888888889, 0.0111111111111111,
> 0.0133333333333333, 0.0155555555555556, 0.0177777777777778, 0.02,
> 0, 0.00222222222222222, 0.00444444444444444, 0.00666666666666667,
> 0.00888888888888889, 0.0111111111111111, 0.0133333333333333,
> 0.0155555555555556, 0.0177777777777778, 0.02), pH = c(12.3979595548431,
> 12.3129161148613, 12.2070984076445, 12.0669463736967, 11.8586790792785,
> 11.4437319273717, 7.64497330556925, 6.98905682614207, 6.63520883742788,
> 6.3229313658492, 12.176061323132, 12.0234712172719, 11.7861230637902,
> 11.2219147985144, 7.14240749824074, 6.53119941380901, 5.95522932117427,
> 3.25184520894594, 2.55614400932465, 2.30097494287507), BC =
> c(0.0576574111386315,
> 0.047331331067055, 0.037206026657832, 0.0268607893098731,
> 0.0166183791472022,
> 0.00639593998967551, 0.00335972794444094, 0.00854377959176608,
> 0.00987464693654883, 0.00863636089604445, 0.0343718830720469,
> 0.0242985554593397, 0.0140710602077036, 0.00383913993097999,
> 0.00439784065436743, 0.00582135949288444, 0.00336240952299985,
> 0.00129948001017736, 0.00640073762860721, 0.0115158433720248),
>      SID = c(25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 15, 15, 15,
>      15, 15, 15, 15, 15, 15, 15)), .Names = c("P", "pH", "BC",
> "SID"), row.names = c(NA, -20L), class = "data.frame")
>
> df1 <- subset(DF1,SID==25)
> df2 <- subset(DF1,SID==15)
> v <- ggplot()
> v <- v + geom_line(data=df1, aes(x=P, y=BC,col=pH,size=3))
> v1 <- v + geom_line(data=df2, aes(x=P, y=BC,col=pH,size=3))
>
> v <- ggplot()
> v <- v + geom_line(data=DF1, aes(x=P, y=BC,group=SID,col=pH,size=3))
>
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