If I recall correctly, it's a known issue that we don't have true ERT in math mode. We can still insert custom LaTeX commands, but sometimes the workaround is limited. For example, in a knitr document (which runs R on commands in the .lyx file and substitutes in the output), R functions and objects can have "_" in their names. I attach an example.
Basically, is there any workaround to be able to use LyX's math mode and output
the LaTeX \Sexpr{mean(x_draws)}?
If I try to paste from LaTeX, LyX converts it to the following:
$\Sexpr{mean(x_{d}raws)}$, which gives a knitr error.
Scott
math_ert_underscore.23.lyx
Description: application/lyx
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