expression_parser: Create a scidb.expression by parsing an R expression

In Paradigm4/SciDBR: An R Interface to SciDB

Create a scidb.expression by parsing an R expression

Description

This recursive methods creates a tree of scidb.expression objects corresponding to the R expression supplied as a parameter.

R variables can be interpolated into the expression by prepending them with the double-exclamation !! operator.

In addition to base R unary and binary operands, this method treats several operations as special cases, and also defines several custom operations of its own that can be used: * ' only be used when the RHS value is a non-symbolic scalar or vector value * ' * ' operands are treated as special cases of the regex function 'stringr::str_detect', and can be applied to symbolic and non-symbolic arguments

Usage

expression_parser(...)

Arguments

...	R expression to parse

Value

scidb.expression object

Paradigm4/SciDBR documentation built on Nov. 9, 2023, 4:58 a.m.