topic Re: how to creat new column if same name column does not exist in Discussions

how to creat new column if same name column does not exist

robust1972 — Mon, 12 May 2014 17:27:55 GMT

hi,

I need to use few columns to do calculation. the question I have is how to create new column and set value of each cell to 0 if same name column does not exist, it there is the column, do nothing. I tried below but it does not work the column already exist. can someone helps me out?

=Data Table( "FinalBiningTable" ) << Get Column Names();

(Column_list);

((contains(Column_list, "N(P, F)"))==0, Data Table( "FinalBiningTable" ) << New Column( "N(P, F)",numeric, ordinal );:Name("N(P, F)") << Set Each Value(0);, empty());

Re: how to creat new column if same name column does not exist

pmroz — Mon, 12 May 2014 21:07:47 GMT

//dt = data table("FinalBiningTable"); // Uncomment for your table

dt = open( "$sample_data\Big Class.jmp" );

column_list = dt << Get Column Names(string);

if (!contains(Column_list, "N(P, F)"),

dt << New Column( "N(P, F)",numeric, ordinal, << Set Each Value(0));

);

Re: how to creat new column if same name column does not exist

robust1972 — Wed, 14 May 2014 13:46:10 GMT

Thanks! PMroz

What is wrong in my lines of code?

Re: how to creat new column if same name column does not exist

pmroz — Wed, 14 May 2014 13:51:08 GMT

The default data type for get column names is a list of columns (of column data type). When you add the string argument you get a list of column names as strings. You were trying to compare a column data type to a string.