Find the first occurrence of an operator in a formula and return the left, right, or both sides of the operator.

Find the first occurrence of an operator in a formula and return the left, right, or both sides of the operator.

findOperator(x, op, side)

Arguments

x	The formula to parse
op	The operator to search for (e.g. +, -, *, /, ...)
side	Which side of the operator would you like to see: 'left', 'right', or 'both'.

Value

The side of the operator requested, NA if requesting the left side of a unary operator, and NULL if the operator is not found.

See also

Other Formula parsing: formula.parseFormula(), parseFormula()