Less than

Main article: Comparison function

<

Less than (<) is a comparison function which tests whether the left argument is tolerantly less than and not equal to the right argument, returning 1 if this is the case and 0 otherwise. It is the negation of Greater than or Equal to (≥).

Less than is also notable as a Boolean function, in which case it returns 1 only if the left argument is 0 and the right argument is 1 (the same as Residue). In particular, Less-than Scan on a Boolean vector returns a vector which indicates the position of the first 1 in the argument, if any:

      <\ 0 0 1 0 0 0 1 0
0 0 1 0 0 0 0 0

Boolean function

Main article: Boolean function

When the arguments to Less than are Boolean, it is the converse nonimplication function:

<	0	1
0	0	1
1	0	0

In the context of logic, it can be read as isn't, as opposed to.

External links

Documentation

• Dyalog
• APLX
• J Dictionary, NuVoc