o_eval: Evaluate an Octave Expression
In renozao/RcppOctave: Seamless Interface to Octave -- And Matlab

Description Usage Arguments Value Octave Documentation for evalin Examples

Evaluates an Octave expression in the current embedded Octave session. The variables assigned in the expression are available for subsequent o_eval calls.

1	o_eval(..., CATCH, unlist = TRUE)

`...`	The Octave expression(s) to evaluate, as a character string.
`CATCH`	The Octave expression(s) to evaluate if the evaluation(s) of `...` fails. See section Octave Documentation for more details.
`unlist`	a logical that specifies it single variables should be returned as a single value (default), or as a list.

the result of the evaluation

\Sexpr[results=rd,stage=render]{if( .Platform$OS.type != 'windows' || .Platform$r_arch != 'x64' ) RcppOctave::o_help(evalin, format='rd')}

[Generated from Octave-\Sexpr{RcppOctave::o_version()} on \Sexpr{Sys.time()}]

# assign some variable 
o_eval("a=10")

# retrieve its value in a subsequent call
o_eval("a")

o_get('a')

# use its value
o_eval("b = a^2")


# multiple expression can be evaluated
o_eval(a="10^3", singular="svd(rand(4,4))", random="rand(10, 1)")
# or from a list
l <- list(a="10^3", singular="svd(rand(4,4))", random="rand(10, 1)")
o_eval(l)

# if the evaluation fails then an error is thrown
## Not run:  o_eval("a=svd()") 

# except if argument CATCH is provided 
o_eval("a=svd()", CATCH="a=2")