JSL: Iterate through columns

matt7109 — Mon, 12 Jun 2017 20:41:34 GMT

Hi, I have 2 questions (very new to this!)

First, I have multple columns of like data, and I need to apply the same formula to all of them. For example, if I had to find the mean of each column, can I automate that through some sort of iteration?

Second, how do I go about saving an operation as a list and not as a new column? For exmaple, if I had the following operation creating a new column in my chart

dt << New Column( "Example", Numeric, Formula(Col Mean( :Height, :Age ) ) );

(Basically finding the mean height for each age), could I simply store this operation as a list that can be used in another operation, rather than a column on my chart?

Thanks!

Re: JSL: Iterate through columns

txnelson — Mon, 12 Jun 2017 21:30:59 GMT

The script below handles your first issue

Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA\Big Class.jmp" );

colnames = dt << get column names( numeric,string );
meanlist = {};
For( i = 1, i <= N Items( colnames ), i++,
	meanlist[i] = Col Mean( column(dt,colnames[i]) )
);

For the second issue, you could meet what you need by creating a character column and then create your 2 or more calculations, convert each of them into a character string, and then concatinate the values together, to place them into a List, convert the list to a string: Char(MyList)......which would end up looking like "{45, 34}";

Or lastly, you could save the list as an expression.

But as far as JMP automatically handling the results in analyses, it currently does not have that capability

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JSL: Iterate through columns

Re: JSL: Iterate through columns