topic Re: How to use function to find the first position greater than the specified starting position? in Discussions

How to use function to find the first position greater than the specified starting position?

lwx228 — Sat, 09 Mar 2019 08:12:56 GMT

Use the function to find the first position of the weight column in the top 5 rows greater than 120.

Excuse me, Thanks!

Re: How to use function to find the first position greater than the specified starting position?

txnelson — Sat, 09 Mar 2019 12:46:03 GMT

Here is one way to do it

Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/big class.jmp" );

dt << New Column( "match",
	formula(
		value = .;
		If( Row() > 5,
			count = 0;
			For( i = Row() - 5, i <= Row() - 1, i++,
				count++;
				If( :weight[i] > 120,
					value = count;
					Break();
				);
			);
		);
		value;
	)
);

Re: How to use function to find the first position greater than the specified starting position?

lwx228 — Sun, 10 Mar 2019 00:48:03 GMT

It seems to me that this kind of calculation is needed by fewer people.

Thank Jim!
This calculation can be done in excel using a simple array formula.
{=MATCH(,IF(E2:E6>120,),)}

Re: How to use function to find the first position greater than the specified starting position?

ms — Sun, 10 Mar 2019 15:51:41 GMT

The JSL function that here corresponds to Excel's Match() would be Loc(). However, Loc() returns a matrix with the position of all matches, not just the first (or last).

Example:

dt << New Column("match",
    formula(If(Row() > 4, Loc(:weight[Row() - 4 :: Row()] > 120)[1]))
);