S {symengine}

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)

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")'.

Value

A Basic S4 object.

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)