symengine (version 0.2.6)

S: Converting R object to Basic

Description

`S` and `Basic` converts a R object to a Basic object. `Symbol`, `Real` and `Constant` construct a Basic object with type "Symbol", "RealDouble"/"RealMPFR" and "Constant", respectively.

Usage

S(x)
Basic(x)
Symbol(x)
Constant(x)
Real(x, prec = NULL)

Value

A Basic S4 object.

Arguments

x

A R object.

prec

If supplied, the argument will be parsed as a Basic object of type RealMPFR.

Details

For double vector, `S` will check whether it is a whole number -- if true, it will be converted to a Integer type. If this behavior is not desired, you can use `Basic` or `as(x, "Basic")`.

Examples

S("(x + y)^2")
S(~ (x + y)^2)
S(NaN)
S(42)
Basic(42)
as(42, "Basic")
pi <- Constant("pi")
evalf(pi)
if (symengine_have_component("mpfr"))
    evalf(pi, 300)
Real(42)
if (symengine_have_component("mpfr"))
    Real(42, prec = 140)