EvalExpressions evaluates one or more expressions, either in string format
an expression, or a collection of expressions.
EvalExpressions is a wrapper around
parse functions in R base package.
It can handle a single, a vector or a list of expressions,
character strings or
envir argument is directly passed to
eval function. If it is not specified,
the parent frame (i.e., the environment where the call to
eval was made) is used instead.
EvalExpressions only evaluates terminal expressions and character strings.
Evaluating non-terminal expressions will result in a warning and
NA is returned.
If one expression is evaluated, a vector of numeric values is returned. Otherwise a data frame with result of each expression in a separate column is returned.
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