Loop for opening files, changing a column name and saving in the original format

[#1]

Hello all,

I've tried to assemble a script for opening a series of files (.dx) and changing the text from one of the columns on each file. I manage to make it work for one or two files individually but if I try a set of four an infinite loop begins. Can anybody please help? There is a chance that the issue is with the files but I would like to vet the script first since I'm a novice at jsl. Ideally, I would like to save the files not as jmp but as dx also. 

Files = Pick File( "Select File(s)", "G:\Retention Compliant\Research\Analytical\Projects\IR database", {"All Files|*"}, 1, 0, "", "multiple" );
For( i = 1, i <= N Items( Files ), i++,
	Try( dt = Open( Files[i], "text" ) );
	wait( 0 );
For( n = 1, n <= N Items (Files), n++, 
colList = dt << get column names( character, string );
For( i = 1, i <= N Items( colList ), i++,
	selRows = dt << get rows where(
		Column( dt, colList[i] )[Row()] == "##YUNITS= % Transmittance" | Column( dt, colList[i] )[Row()] == "##YUNITS= % T"
	);
	If( N Rows( selRows ) > 0,
		Column( dt, colList[i] )[selRows] = "##YUNITS= % T";
	);
);
) );

[#2]

1) reformat your JSL using the editor right-click popup. You'll be able to see the nesting better.

2) you are reusing the i variable in the inner loop. That's causing the loop.

3) remove the try() wrapper, or make it do something when it catches an error.

[#3]

Thanks Craige, it works now with all files and no errors! Any ideas how to save in the original format (.dx) and preferably preserving the file name?

[#4]

Not sure what dx is, but you can save with .csv extension and probably be close. 

[#5]

I have annotated the script below with the issues I found.  I am surprised you can read in a .dx file.  JMP certainly does not support the writing out of .dx files(as far as I know).

Files = Pick File(
	"Select File(s)",
	"G:\Retention Compliant\Research\Analytical\Projects\IR database",
	{"All Files|*"},
	1,
	0,
	"",
	"multiple"
);
For( i = 1, i <= N Items( Files ), i++,
	// Open one file
	Try( dt = Open( Files[i], "text" ) );
	Wait( 0 );
	// Loop from 1 to the number of files (even though only 1 file has been opened)
	For( n = 1, n <= N Items( Files ), n++,
	    // Here you will be reading the column names in for the first file over and over
		colList = dt << get column names( character, string );
		// Loop using "i" as the index across all of the columns....in the first file
		// since that is all we have read in.....but since you are using "i", you will
		// be creating an infinate loop, since you are using "i" for the first loop
		// and you will be interferring with the assumed stepping for the outter loop
		For( i = 1, i <= N Items( colList ), i++,
			selRows = dt << get rows where(
				// You are not in a formula, so the Row() function will not provide a predictable result
				Column( dt, colList[i] )[Row()] == "##YUNITS= % Transmittance" | Column( dt, colList[i] )[Row()] ==
				"##YUNITS= % T"
			);
			If( N Rows( selRows ) > 0,
				Column( dt, colList[i] )[selRows] = "##YUNITS= % T"
			);
		);
	);
);