How to get last entry of raw?

[#1]

I have multiple measurement for a same part number in a raw. How can I get last entry in a one column.

[#2 · Accepted solution]

this might work:

// make a column to hold results, it will be last column
dt << newcolumn("answer");
for(irow=1,irow<=nrows(dt),irow+=1,
	// assumes columns 1 and 2 and last are NOT data...
	// grab one row at a time...
	vec = dt[irow, 3::(ncols(dt)-1)];
	// get indexes (loc) of non-missing values...pick the right-most (max)
	nonmissindex = max(loc(vec));
	// handle possible edge case (no data)
	value = if(ismissing(nonmissindex),.,vec[nonmissindex]);
	// fill in the answers
	dt:answer[irow] = value;
);

If you turn this into a column formula, you'll want to list the source columns explicitly for table updates and not needing dt.

dt << New Column( "answer",
	formula(
		vec = run_1 || run_2 || run_3 || run_4;
		nonmissindex = Max( Loc( vec ) );
		If( Is Missing( nonmissindex ),
			.  // missing if all missing 
               , //
			vec[nonmissindex]
		);
	)
);

As a formula, the answer column will update when the data changes.

[#3 · Accepted solution]

Here is the formula I cam up with

dt = Current Data Table();
x = Row();
col = Length( Loc( dt[x, Index( 3, 6 )] ) ) + 2;
dt[x, col];