CODEWITHSUNDEEP
rggplot2
juansalix
juansalix

Reputation: 533

Function scale_size_manual() isn't affecting the size of the points when using ggplot() in R

I'm using the function scale_size_manual() for the first time. I'm trying to decrease the size of the points using the script below:

p2<-ggplot(data = dfnew, aes(x = Area, y = Proportion, group=linegroup)) +
  geom_point(aes(shape = as.character(Collar)), size = 6, stroke = 0, 
             position = myjit)+
  geom_line(aes(group = linegroup),linetype = "dotted",size=1, position = myjit) +
  theme(axis.text=element_text(size=15),
        axis.title=element_text(size=20)) +
  geom_errorbar(aes(ymin = Lower, ymax = Upper), width=0.3, size=1,
                position = myjit) + scale_shape_manual(values=c("41361´"=19,"41365´"=17)) + scale_size_manual(values=c(2,2)) +
  scale_color_manual(values = c("SNP" = "black", 
                                "LGCA" = "black")) + labs(shape="Collar ID") + ylim(0.05, 0.4)

However, the size of the points doesn't regardless of the number entered. I've seen other internet posts implementing this function in the same way, so I wondered if somebody could set me on the right track?

Thanks in advance!

P.S. My data:

> dput(dfnew)
structure(list(Proportion = c(0.181, 0.289, 0.099, 0.224), Lower = c(0.148, 
0.242, 0.096, 0.217), Upper = c(0.219, 0.341, 0.104, 0.232), 
    Area = c("LGCA", "SNP", "LGCA", "SNP"), Collar = c("41361´", 
    "41361´", "41365´", "41365´"), ymin = c(0.033, 0.047, 0.003, 
    0.00700000000000001), ymax = c(0.4, 0.63, 0.203, 0.456), 
    linegroup = c("LGCA 41361´", "SNP 41361´", "LGCA 41365´", 
    "SNP 41365´")), class = c("tbl_df", "tbl", "data.frame"), row.names = c(NA, 
-4L))

Upvotes: 1

Views: 4474

Answers (1)

Arienrhod
Arienrhod

Reputation: 2581

You're setting the size of your points in the geom_point layer by using the argument size.

geom_point(aes(shape = as.character(Collar)), size = 6, stroke = 0, 
           position = myjit)+

The only way to decrease the size of the points in your case is by decreasing size, e.g. to 4.

geom_point(aes(shape = as.character(Collar)), size = 4, stroke = 0, 
           position = myjit)+

You can only use scale_size_manual if the size is mapped within aes using a variable within data, like in the example below.

ggplot(data = dfnew, aes(x = Area, y = Proportion, group = linegroup, size = Area))

Upvotes: 2

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