Summerize/Summary aggregation function for character data. Concat Charcter Vector into a Scalar (by)

[ewittry1]

Generalize the code to work with Summerize/Summary.

dt = current data table();

Summarize( g = By(:Column 0, :Column 1 ) );

For( i = 1, i <= N Items( g[1] ), i++,

   r = dt << Get Rows Where( dt:Column 0 == g[1][i] & dt:Column 1 == g[2][i]);

   dt:Column 3[r] = Concat Items( dt:Column 2[r], "_" );

);

nt = dt << Summary( Group( :Column 0, :Column 1, :Column 3 ) );

[Ryan_Gilmore]

We are archiving this request. If this is still important please comment with additional details and we will reopen. Thank you!

[hogi]

very useful :)

Up to now, I used Split to sort the entries, combine them and merge them back to the main table:

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

//--------
dt << new column ("rank", Formula( Col Rank( :name, :age ) ));

// put names next to each other, grouped by age
DTsplit=dt<< Split(
	Split By( :rank),
	Split( :name ),
	Group( :age )
);

// Combine columns to a linge column 
DTsplit << Combine Columns(
	columns(
		:"1"n, :"2"n, :"3"n, :"4"n, :"5"n, :"6"n, :"7"n, :"8"n, :"9"n, :"10"n,
		:"11"n, :"12"n
	),
	Column Name( "allNames" ),
	Delimiter( "," )
);

//-----

// Update data tables
dt<< Update(
	With( DTsplit ),
	Match Columns( :age = :age ),
	Add Columns from Update Table( :allNames ),
	Replace Columns in Main Table( None )
);

to get:

If Summarize had an option to concatenate strings, the whole part between the //---- could be replaced by a simple Summarize.

[hogi]

new version of this Wish:

Summary and Tabulate: add aggregation option for Character columns