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Logical

Data

Logical (Boolean)

data

consists

only

ones

and

zeros.

The

relational

functions

= <

~:;t)

generate logical

data

their

result;

the

result

1 if

the

condition

was

true

and

0 if

the

condition

was false.

The

output

can

then

be used as

arguments

the

logical

functions

(/\I\vv",)

check

for

certain

conditions

being

true

false.

Logical

data

can also be used

with

the

arithmetic

functions,

in which case it

treated

as numeric 1's

and

D's.

SCALAR

A single item,

whether

a single

number

single

character

constant,

called a

scalar.

It has

coordinates;

that

is, it

can

thought

as a

geometric

point.

The

follow-

ing

are

examples

scalars:

• A I

,,,'

Scalars can be used

directly

in calculations

can be assigned

a variable name.

The

variable

name

for

the

scalar can

then

be used

the

calculations:

2x3

I.>

l~f'2

Bi"~:~

(.·~+B

c·

ARRAYS

Array

the

general

term

for

a collection

data,

and includes scalars (single

data

items), vectors (strings

data),

matrices (tables

data),

and

arrays

higher

dimensions

(multiple

tables). All primitive (built-in)

functions

are designed

handle

arrays.

Some

functions

are designed specifically

handle arrays

rather

than

scalars.

Indexing,

for

example, can select

certain

elements

from

an array

for

processing.

Release Year	1975
RAM	16 KB - 64 KB
Storage	204 KB tape drive
Display	5-inch CRT
Operating System	APL/BASIC
Processor	IBM PALM (1.9 MHz)

IBM 5100 Apl Reference Manual

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