How to Tell JMP to continue running the Script when Column is Missing

[#1]

Hi - when creating a summary table below, does anyone know how to code in JSL to allow the script to continue running  if any one of the columns below do not exist? 

dt3 << Summary(Sum( :Fail, :Not Assessed, :Weak));

Thanks!

[#2]

You need to do a little bit of code safing on the list of columns to summarize.

Here is my example:

dt3 = Current Data Table();
columns to summarize = {"fail", "not assessed", "weak"};	//columns you're interestd in, may or may not exist within table
column names = dt3 << Get Column Names( "String" );		//we need to grab the table columns to utilize only available columns
columns as names = {};						//we need to wrap both column names and our columns of interest in 
For( i = 1, i <= N Items( column names ), i++,			//  'As Name( ... )' to avoid issues with capitalization and such
	columns as names[i] = As Name( column names[i] )	//  loop here
);

columns to summarize within table = {};
For( i = 1, i <= N Items( columns to summarize ), i++,
	If( Contains( columns as names, As Name( columns to summarize[i] ) ),	// check to see that name exists as column header
		Insert Into( columns to summarize within table, columns to summarize[i] )
	)
);
Eval( Eval Expr(
	dt3 << Summary( Expr( Substitute( columns to summarize within table, {}, Expr( Sum ) ) ) ) //fancy substitution for the summary table
) )

[#3 · Accepted solution]

I find the easiest way to do this, is to create a list of the columns available, and then reference that list in the Summary platform.

Names Default To Here( 1 );
dt3 = Current Data Table();
colList = dt3 << get column names( continuous, string );
dt3 << summary( Sum( Eval( colList ) ) );

There are multiple ways to populate the list, and to delete items from the list.  See the documentation on manipulating lists in the Scripting Guide

[#4]

This worked. Thank you!