How to pass a value into a string in ggplot?

Question

Is it even possible to pass a value in ggplot?

It is possible in a console using cat

v <- 8
ggplot(df, aes(x = Category, y = Fold_Change, color = Category)) +
labs(y= "RNA expression", x = cat("p-value = 0.08831", v) )

but what about graph?

cat says 'print to console'. Try using paste() here.

Andy Baxter
– Andy Baxter

2022-11-19 00:53:23 +00:00
Commented Nov 19, 2022 at 0:53 — Andy Baxter
– Andy Baxter, Commented Nov 19, 2022 at 0:53

Karl Edwards · Accepted Answer · 2022-11-19 01:24:41Z

1

Use sprintf instead of cat, for example:

x = sprintf("%s %f %d", "p-value = ", 0.08831, v) )

I don't see any geom phrase in your example. I put some bogus data into a data.frame and used geom_point() to produce a plot for this example.

v <- 8
ggplot(df, aes(x = Category, y = Fold_Change, color = Category)) +
geom_point() + 
labs(y= "RNA expression", x = sprintf("%s %f %d", "p-value = ", 0.08831, v) )

edited Nov 19, 2022 at 1:24

answered Nov 19, 2022 at 1:17

Karl Edwards

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