R/ggplot2: use literal strings on parse()

Question

Can part of the string I pass to parse(text=...) be taken as a literal string? Literal string means it will not try to interpret it.

For instance, I want to have the text "p-value" text in a plot (with the p italicized).

I am doing:

library(ggplot2)
ggplot(data.frame(x=rnorm(500)), aes(x)) + geom_histogram() + geom_text(label='italic(p)-value==0.10', parse=TRUE, x=-2, y=40)

Result:

pvalue

The hyphen has a little too much padding and too big (because it takes it as the subtraction symbol), and it is not showing the number with the full precision I have used.

Can I just tell him to take part of that string as is?

MrFlick · Accepted Answer · 2015-07-13 00:01:22Z

3

How about this:

ggplot(data.frame(x=rnorm(500)), aes(x)) + 
    geom_histogram() + 
    annotate("text", label='italic(p)*"-value"=="0.15"', parse=TRUE, x=-2, y=40)

Here we use double quotes to specify character values and use * to place them right next to expressions.

Also note the change to annotate() rather than geom_text(). The latter would print out a 500 labels at the same location since it's tied to the data you specified in the ggplot call.

With set.seed(15), I get

enter image description here

edited Jul 13, 2015 at 0:01

answered Jul 12, 2015 at 23:55

MrFlick

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1 Comment

Ricardo Cruz Over a year ago

I did not know you could use "-quotes within '-quotes. This is great! Thank you!

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