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I searched for this, but wasn’t able to find it. In a knitr document, I want to put $\alpha_1$ as the caption to a plot like so:
<<fig.cap='$\alpha_1$'>>=
plot(1:5,1:5)
@
Trying to knit this comes back with the error
! Text line contains an invalid character.
l.172 ...axwidth]{figure/plotSigma1} \caption[$^^G
lpha_1$]{$^^Glpha_1$\label...
Is there a way?
Nevermind – you simply need to escape the \ for alpha