Guides/General FAQ/How do I define the rank of a verb I create?

How do I define the rank of a user-defined verb?

If I write my own verb and want to specify a default rank, how do I do this?

Simply specify the rank in the definition, e.g. for an explicit function:

   myVecVerb=: 3 : 0"1   NB. Apply to rank 1 objects
   (+/y)-<./y            NB. Sum less smallest in row
)
   (i.3 3);myVecVerb i. 3 3
+-----+------+
|0 1 2|3 9 15|
|3 4 5|      |
|6 7 8|      |
+-----+------+

   myMatVerb=: 3 : 0"2   NB. Apply to rank 2 objects
   (+/y)-<./y            NB. Sum less smallest in column.
)
   (i.3 3);myMatVerb i. 3 3
+-----+-------+
|0 1 2|9 11 13|
|3 4 5|       |
|6 7 8|       |
+-----+-------+

Specify for a tacit definition in much the same way:

   myVecVerb=: (+/-<./)"1
   myMatVerb=: (+/-<./)"2

More info

See Also

General introduction to the concept of rank in J

"Studio" introduction to rank with examples

Rank Explanation of how negative values of rank work

FAQ/Atop Rank How to determine the rank of verb combinations

Examples of explicit definition

Different ways to define a verb