The SelectNonNumeric function selects non-numeric items from X and returns them in a new data sample. Note, that an expression X is considered non-numeric if  does not return a floating-point number. Numeric items are discarded in the newly created data sample.

The first parameter X is a data sample which must given as an Array or a list.

The RemoveNonNumeric function does the opposite of SelectNonNumeric. It removes the non-numeric values from X.

The options argument can contain one or more of the options shown below.

exclude=infinity, undefined, or [infinity, undefined] -- By default, undefined and infinity are considered non-numeric. This can be changed by adding infinity or undefined or both to the exclude list. Thus, exclude=undefined means that infinity should still be considered numeric but undefined should not.