Latex parentheses in R plot

Question

I am using latex2exp package to add math expression in a plot with R. I have an error when I use \\\left( to resize a parenthesis to encompass a fraction. Can someone can help ? Thanks.

ttt <- TeX("$(\\\left(\\\frac{M}{L} = 0.08$")

I have the following error message when I use \\\\left(

Original string: $\left( \frac{M}{L} = 0.08$
Parsed expression: paste('','',bgroup('(', paste('','',frac(paste('M'), paste('','L')),'',phantom() == phantom(),'0','.','08','') )
Error in parse(text = str) : :2:0: unexpected end of input 1: paste('','',bgroup('(', paste('','',frac(paste('M'), paste('','L')),'',phantom() == phantom(),'0','.','08','') ) ^

Answer 1

Tex expects that for each \left you also write a \right. This is neccessary to calculate the height of the brackets, as e.g. \left(0.08 \right) = \frac{M}{L} produces brackets of a different height than \left(0.08 = \frac{M}{L}\right).

You example works with

TeX("$(\\left(\\frac{M}{L} = 0.08\\right)$")

Note that we have to add extra backslashes to the TeX code to make it work in R.