plot - How do I write " *value* *plus-minus sign* *value* ", along with text, with annotate of ggplot2, R? -

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here's problem:

library(ggplot2)  = c(4, 2) x = c(1:4) y = c(1:4)  # works (τ^-1 = 4 s^-1):  l <- paste("tau^-1 ==", a[1], "*~s^-1") qplot(x, y) + annotate("text", x = 1.5, y = 3.5, parse=true, label = l);  # see ( τ^-1 = 4 ± 2 s^-1):   l <- paste("tau^-1 ==", a[1], "\u00b1", a[2], "*~s^-1") qplot(x, y) + annotate("text", x = 1.5, y = 3.5, parse=true, label = l);

it gives me error:

error in parse(text = lab) : <text>:1:13: unexpected input 1: tau^-1 == 4 ±                 ^

can me please? thank in advance!

if set parse = true label displayed described in ?plotmath. on page can find table avaiable features , proper syntax.

in case have use %+-% instead of unicode symbol \u00b1 r able coerce expression.

 l <- paste("tau^-1 ==", a[1], "%+-%", a[2], "*~s^-1")  qplot(x, y) + annotate("text", x = 1.5, y = 3.5, parse=true, label = l)

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