<. y (Floor)
The monadic form of <. gives the floor of its right argument (y) , that is, the largest integer less than or equal to y.
For example:
<. 4.6 4 <. 4.2 4.5 4.6 4 4 4 <. 4.6 4 _4 _4.6 4 4 _4 _5
Common uses
Floor (and Ceiling (<.)) can also be useful for testing whether values are integers or not.
3 3.14 5 = <. 3 3.14 5 1 0 1
Floor (and Ceiling (<.)) can be useful for forcing floating point representations of integers to be integers in order to save memory (8 vs 4 bytes per value). Values like this can arise as a result of operations like Divide (%). For example:
27 % 9 3 datatype 27 % 9 floating <. 27 % 9 NB. or: 27 <.@:% 9 3 datatype <. 27 % 9 integer
See Also
Entry in the J Dictionary for <.
x <. y (Lesser of (Min))
The dyadic form of <. gives the lesser of its left (x) and right (y) arguments.
For example:
3 <. 4 3 3 <. 4 _4 3 _4 2 3 <. 4 1 2 1
Common uses
<. can be used in conjunction with Insert (/) to find the minimum value in a list.
<./ 7 8 5 9 2 NB. minimum value in a list
2
<./\ 7 8 5 9 2 NB. running minimum
7 7 5 5 2