object.extract: Extract mathematical functions or variables
In ComplexAnalysis: Numerically Evaluate Integrals and Derivatives (also Higher Order) of Vector- And Complex-Valued Functions

Description Usage Arguments Details Value Author(s) See Also

The function extract mathematical functions or variables from a string which is usually the body of a function. If one wishes to extract directly from a function, such function must first be converted into a string. Another function in this package body2string does this.

1	object.extract(func, variable = TRUE, subset.q = TRUE, exception = NULL)

`func`	A string. Although it is named as "func", this argument must be string-type. Function `body2string` converts an R function into a string.
`variable`	If `TRUE`, only mathematical variables in `func` will be extracted, otherwise mathematical functions will be extracted.
`subset.q`	If `TRUE`, the square bracket (usually used as subsetting) is recognised as part of the attached variable. E.g. `x[a:b]` will be recognised as one single variable while if `FALSE`, square brackets are ignored and three variables `x,a,b` are returned.
`exception`	String. Mathematical variables or functions not to be extracted. Can be a vector.