[R] single, double or no quotes in expression
hettling at few.vu.nl
Thu Mar 15 15:55:38 CET 2012
I am confused about how to create an expression. I use a package (rsbml)
which uses expressions and seems to make a difference if there is a quote
around the expression or not.
For example, package works with expressions such as
> expression(A + B)
but not with
> expression("A + B")
I now have a set of math expressions represented as strings, something like
> rhs_eq<- c("0", "A + B", "B * (2+C)")
and want to make expressions without quotes out of it.
> lapply(lapply(rhs_eq, as.symbol), as.expression)
which only turns the double quotes into single quotes, but does not remove
I also played around with as.formula, as.name, quote and enquote, but had no
Does anyone know about quotes in the expression data type?
Thanks in advance,
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