IBM 5100 Apl Reference Manual

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APL OPERATORS
An APL operator applies one or more dyadic primitive scalar functions to arrays.
The operators are reduction, inner product, outer product, and scan.
Reduction Operator If) CD
The symbol for the reduction operator is I. The forms of reduction are: (DIU] B or
CD/B orC!),£B, where(f)can be any primitive dyadic scalar function that is applied
between each of the elements of a single vector.
The rank 'of the result is one less than the rank of argument B, unless argument B
is a scalar or a single-element vector; then the result is the value of the single element
of argument B. When argument B is a vector, the reduction of that vector is the same
as putting the primitive dyadic function between each of the elements:
10
10
Bf-:1. 2 3 1+
+/B
If argument B is an empty vector (see Chapter 3), then the result is the identity
element, if one exists, for the specified function. The identity elements are listed
in
the following table:
Identity Element Table
Dyadic
Function
Times
Plus
Divide
Minus
Power
Logarithm
Maximum
Minimum
Residue
Circular
Binominal
Or
And
Nor
Nand
Equal
to
Not equal to
Greater than
Not less than
Less than
Not greater than
x
+
*
~
r
L
I
o
!
v
/I.
V
A
>
~
<
~
Identity
Element
1
o
1
o
1
-7.237 ... E75
o
1
o
1
7.237 ... E75
1 )
o I Apply for
o ~ logical
1
~ arguments
~, only
111

IBM 5100 Specifications

General

Brand	IBM
Model	5100
Category	Laptop
Language	English