How to distinguish whether there are empty values in a column?
I want to distinguish whether the cells in the column are empty using "is missing". In the JSL below, I hope to differentiate between the "name" and "Apple" fields, but the results are all 1. How should I modify it?
dtTest = Open( "$SAMPLE_DATA/Big Class.jmp" );
show(IsMissing(:age));
dtTest << New Column( "Apple", "Character", "Nominal" );
show(IsMissing(:Apple));