How to change correlation text size in ggpairs()

Question

I'm using ggpairs() in the GGally package. The pairs plot is of four continuous variables, and I gave another column, a factor with 2 levels, to a colour argument which worked very nicely, both coloring the points as I expected and (bonus!) in the upper-diagonal part of the plot reporting the correlations by that factor level. My only problem is that the text reporting the correlations is too small.

Can I increase the size of the text reporting correlations in a ggpairs() plot?

I tried giving a cex argument, it seems to have no effect. I'm already using size for yet another variable; it doesn't affect the text.

For a specific example:

require(GGally)
mtcars$cyl <- as.factor(mtcars$cyl)
ggpairs(mtcars, columns = c(1, 5), colour = "cyl")

Gregor Thomas · Accepted Answer · 2017-08-18 16:05:06Z

37

For anyone finding their way to this thread in 2017 and beyond, this has changed slightly.

See schloerke's answer here: https://github.com/ggobi/ggally/issues/31

ie. to change the font size used in the correlations, use the upper parameter to the ggpairs function like so:

ggpairs(mtcars, columns = c(1, 5), colour = "cyl",
    upper = list(continuous = wrap("cor", size = 9)))

edited Aug 18, 2017 at 16:05

Gregor Thomas

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answered Aug 18, 2017 at 8:29

falconaerie

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Comments

ordinator · Accepted Answer · 2012-07-02 17:56:28Z

13

You can also specify the correlation text size in the params. For your example, you could specify a correlation font size of 12 as follows:

require(GGally)
mtcars$cyl <- as.factor(mtcars$cyl)
ggpairs(mtcars, columns = c(1, 5), colour = "cyl", params=list(corSize=12))

answered Jul 2, 2012 at 17:56

ordinator

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3 Comments

mlt Over a year ago

Somehow corSize makes no difference for me but size does. So it might be upper=list(params=list(size=12))). I wonder if things have changes over 2 years.

helcode Over a year ago

at the time of posting this comment \\ The use of params has been deprecated, you will need to use something similar to upper = list(continuous = wrap("cor", size=12))

Adel Over a year ago

How about fixing the spacing of each line or correlations when having groups?

Marco · Accepted Answer · 2011-12-22 09:19:48Z

4

I dont know if this is the most elegant solution, but in ggpairs you can change single plots in your plot matrix. So if you create a correlation plot like so

my_cor <- ggally_cor(mtcars, aes_string(x = "mpg", y = "drat", colour = "cyl")
          , corSize = 10)

you can insert this plot into your old matrix with

old_matrix <- ggpairs(mtcars, columns = c(1, 5), colour = "cyl")
new_matrix <- putPlot(old_matrix, my_cor, 1, 2)

answered Dec 22, 2011 at 9:19

Marco

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1 Comment

bright-star Over a year ago

Any idea how efficient this is? Do you pay the processing time of 1 additional plot to do this?

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