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Evaluating Col Mean with Iterations

Hi everyone, 

 

I'm having trouble evaluating a col mean function. As you can see below, the col mean(:age, :list_col_names[i]] doesnt insert the item in the list on the data table. With this current configuration, when I open the formula on the data table I get "Col Mean( :age, list_col_names[i] )" which doesnt correspond to anything on the list_col_names list.

list_col_names = fdt << getColumnNames( "String" );

For( j = N Items( list_col_names ), j > 0, j--,
 If( Left( list_col_names[j], 2 ) != "10",
  Remove From( list_col_names, j )
 )
);

For( i = 1, i <= N Items( list_col_names ), i++,<BR /> fdt << New Column( list_col_names[i] || "_age", Numeric, Formula( Col Mean( :age, :list_col_names[i] ) ) ) <BR />);

on in an iteration

Re: Evaluating Col Mean with Iterations

Works great. Thank you Vince!

Re: Evaluating Col Mean with Iterations

you can't do :list_col_names[i], You're explicitly stating that you have a column called "list_col_names" and you're pulling the ith row of it.  

 

Try this

 

Names Default to here(1);
fdt = open("$SAMPLE_DATA\Big Class.jmp");
list_col_names = {"sex", "name"};

For( i = 1, i <= N Items( list_col_names ), i++,
 //this is just it doesn't keep the variable 
 //in the table because i will change and then your column name will change
 Eval(
  EvalExpr(
   fdt << New Column( list_col_names[i] || "_age", 
    Numeric, 
    Formula( Col Mean( :age, 
     //replaces the string column name with an actual column
     Expr(Column(fdt, list_col_names[i]))
      
    ) ) 
   )
  )
 )
);