difference of values

sgenzer

OK I know there is an easy way to do this but cannot get my brain around it.  If I have an attribute that contains integers in ascending order but they are not sequential, how do I create a new attribute that shows the difference between each example and the one before it?  For example:

 

att1         delta

1             ?

3             2

4             1

5             1

17           12

20           3

 

etc..

 

Thanks.

Scott

MartinLiebig

Scott,

 

the Lag operator is your friend.

 

Generally speaking: All operations which requiere cross-example operations are rather in the time series extension than in core.

 

~Martin