Column formula dependency cycle error

[#1]

Hi all, 

Just wonder how we can do circular references in JSL.For example, I have a population qty and failure rate. But the failure rate for each year depends on the survive parts.

Year Original equipment   Failed    Survive

1        100                           1             99

2        99                             2             97   

3        97                             3             94

I know JMP doesn't allow a column to have a formula depends on the other formulated column. Is there a trick to work around for this case?

Thanks

Thanks

[#2]

You can have formula columns in JMP which use other formula columns.

How would you input new data in your case? Which columns should be calculated and based on which column(s)?

[#3]

With the original qty and the fails values you can fill in all values. (*)
So you could set up a script which is triggered every time a value is keyed in.

You have to click once on **)

... then everything will be fine:

If rows are added or an input value (*) is changed, the table gets updated - all the other changes will be ignored.

New Table( "test",
	Add Rows( 7 ),
	New Column( "original", Set Values( [100, ., ., ., ., ., .] ) ),
	New Column( "failed", Set Values( [1, 2, 3, 5, 32, 2, 6] ) ),
	New Column( "Survive" )
);

:survive << set	Formula(
	If( Row() != 1,
		:original = Lag( :Survive )
	);		
	:original - :failed;
);
	
Wait( 0 );

:survive << set	Formula(
	If( Row() != 1,
		:original = Lag( :Survive )
	);		
	:original - :failed;
);

edit:
hm, I don't know the difference to last time, but now the auto-update doesn't work at first place 
--> so just trigger it twice
[I hope that tomorrow I won't need 3 trials ...]

edit:
unnecessary For each row removed.

**)

- any idea how to get rid of this message? -> 

- any idea why the last :survive entry is missing [at least this is better today: not missing anymore :]

- any idea why today I need the formula command 2x ???

[#4]

Thanks for your suggestion. This is how I would set it up, but it only iterates for 2 rows and would take to long for just that row. 

New Table( "test",
	Add Rows( 7 ),
	New Column ("Year", Set Values ([1,2,3,4,5,6,7])),
	New Column ("Failure Rate", Set Values ([0.1,0.1,0.15,0.2,0.25,0.3,0.35])),
	New Column( "original", Set Values( [100, ., ., ., ., ., .] ) ),
	New Column( "failed", formula (:Failure Rate *:original) ),
	New Column( "Survive", formula (:original - :failed ))
);

Wait( 2 );

For Each Row(
			If( Row() != 1,
				:original = Lag( :Survive )
			)
);

[#5 · Accepted solution]

Calculate new Original column and use that for your calculations

Names Default To Here(1);

dt = New Table("test",
	Add Rows(7),
	New Column("Year", Set Values([1, 2, 3, 4, 5, 6, 7])),
	New Column("Failure Rate", Set Values([0.1, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35])),
	New Column("original", Set Values([100, ., ., ., ., ., .])),
	New Column("failed", formula(:Failure Rate * :original)),
	New Column("Survive", formula(:original - :failed))
);

dt << New Column("OriginalF", Numeric, Continuous, Formula(
	If(Row() == 1,
		:original
	,
		Lag(:OriginalF) - Lag(:OriginalF) * Lag(:Failure Rate)
	);
));

dt << New Column("FailedF", Numeric, Continuous, Formula(
	:OriginalF * :Failure Rate;
));

dt << New Column("SurviveF", Numeric, Continuous, Formula(
	:OriginalF - :FailedF
));

[#6]

Thank you @jthi. That's a very clever way to break the reference cycle. 

[#7]

funny, like an old car

good that it starts after the 2nd try. 
same on your side?

New Table( "test",
	Add Rows( 7 ),
	New Column( "Year", Set Values( [1, 2, 3, 4, 5, 6, 7] ) ),
	New Column( "Failure Rate",
		Set Values( [0.1, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35] )
	),
	New Column( "original", Set Values( [100, ., ., ., ., ., .] ) ),
	New Column( "failed" ),
	New Column( "survive" )
);

start = Function( {},
	:survive << set formula(
			If( Row() != 1,
				:original = Lag( :Survive )
			);
			:failed = :Failure Rate * :original;
		:original - :failed;
	)
);

start();


start();

[#8]

@jthi wrote:

Calculate new Original column and use that for your calculations

and then: switch back to the old column names.
So, the trick is: don't use the "fails" to calculate the original values

Names Default To Here(1);

New Table( "test",
	Add Rows( 7 ),
	New Table Variable( "original", 100 ),
	New Column( "Year", Numeric, "Continuous", Format( "Best", 10 ), Set Values( [1, 2, 3, 4, 5, 6, 7] ) ),
	New Column( "Failure Rate",
		Numeric,
		"Continuous",
		Format( "Best", 10 ),
		Set Values( [0.1, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35] )
	)
);


New Column("Original", Numeric, Continuous, Formula(
	If(Row() == 1,
		:original
	,
		Lag(:Original) - Lag(:Original) * Lag(:Failure Rate)
	);
));

New Column("Failed", Numeric, Continuous, Formula(
	:Original * :Failure Rate;
));

New Column("Survive", Numeric, Continuous, Formula(
	:Original - :Failed
));