julia_eval: Evaluate string commands in julia and get the result back in R.
Description
julia_eval evaluates string commands in julia and
returns the result to R.
The returning julia object will be automatically converted
to an R object or a JuliaObject wrapper,
see the documentation of the argument `need_return` for more details.
`julia_eval` will not invoke julia display system.
If you don't need the returning result in R or
you want to invoke the julia display system, you can
use julia_command.
Usage
julia_eval(cmd, need_return = c("R", "Julia"))
Arguments
cmd
the command string you want to evaluate in julia.
need_return
whether you want julia to return value as an R object or
a wrapper for julia object.
Value
the R object automatically converted from julia object.