Notes
Indexing
Simple indexing is the case when the indexer is a list of semicolon-separated simple arrays, as opposed to choose and reach indexing, where indexer is a nested array:
Simple Indexing Example
A[;;2;(2 3⍴1)]
Choose Indexing Example
A[(2 1)(2 2)]
Reach Indexing Example
A[⊂((2 1) 1 5)]
For choose and reach indexing, the indexer will be represented by itself, in the monitor log, because it is a true array. A simple indexer, though, is not a true array but a collection of arrays, so it is treated specially : it is represented in the monitor log by a character array, the rank of which is the number of subscript, and the shape of which is the number of items in each subscript.
Indexer Examples
[2 3⍴1] will be represented as a rank-1 character array of shape 6
[1;4 5;7 8 9] will be represented as a rank-3 character array of shape 1 2 3
[;] will be represented as a rank-0 character array
[;5;0 2⍴1] will be represented as a rank-2 character array of shape 1 0
They cannot be misinterpreted because character arrays are illegal as an indexer.
In the monitor, for indexing, A[I], the left argument will be A and the right argument will be the representation of I as described above.
For indexed assignment, A[I]←B, the right argument will be B, and the left argument will be the representation of I as described above.
Operators
In an expression in which an operator takes primitive operands, APLMON will report the time for the operator itself. If one of the operands is non-primitive, APLMON will report the time used by the operands.
Examples
∇ APLMON expr
[1] 2 ⎕NQ'.' 'APLMON' 'c:\dyalog17.0\aplmon'
[2] ⍎expr
[3] ⎕CSV 2 ⎕NQ'.' 'APLMON' ''
∇
APLMON '+/1 2 3'
6
token lfn rfn ltype rtype lrank rrank lbound rbound hitcount time
slash plus int8 1 2<4 1 0.000003
stranding wchar8 wchar8 1 1 5<9 0<0 1 0.000001
name lookup 1 0.000001
aplmon measurement time 0.000005
aplmon unmeasured time 0.003220
aplmon total 0.003229
APLMON '{⍺+⍵}/1 2 3'
6
token lfn rfn ltype rtype lrank rrank lbound rbound hitcount time
plus int8 int8 0 0 1<1 1<1 2 0.000001
stranding wchar8 wchar8 1 1 5<9 0<0 1 0.000001
name lookup 1 0.000001
aplmon measurement time 0.000007
aplmon unmeasured time 0.003490
aplmon total 0.003500
APLMON '+.×/1 2 3'
6
token lfn rfn ltype rtype lrank rrank lbound rbound hitcount time
dot plus times int8 int8 0 0 1<1 1<1 1 0.000007
dot plus times int8 int32 0 0 1<1 1<1 1 0.000001
stranding wchar8 wchar8 1 1 5<9 0<0 1 0.000001
name lookup 1 0.000001
aplmon measurement time 0.000005
aplmon unmeasured time 0.003058
aplmon total 0.003073