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Atari XL User Manual

Atari XL
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Functions
SIGNS
65
SGN(N)
returns
a
value
which
indicates
the
sign
of
a
number
or
variable
N.
If
the
number
is
positive,
the
result
is 1;
if
the
number
is
zero,
the
result
is
zero;
and
if
the
number
is
less
than
zero,
SGN
returns
-1.
PRINT
SGN
(5)
PRINT
SGN
CO)
PRINT
SGN
(-7)
displays
(1'
displays
(0',
and
displays
(-1'.
TRIGONOMETRY
The
trigonometric
functions
of
sine,
cosine
and
arctangent
are
available
in
Atari
BASIC.
They
are
written:
SIN(N)
COS(N)
ATN(N)
where
N
is
a
number
or
a
variable.
The
angles
may
be
expressed
either
in
radians
or
degrees.
When
first
switched
on,
and
after
a
RUN
command,
the
Atari
treats
all
angles
as
being
in
radians.
To
swi
tch
to
degrees
use
the
command
DE
G.
The
corresponding
command
RAD
returns
.
the
Atari
to
radian
mode.
A
radian
is
the
ratio
of
the
length
of
an
arc
of
a
circle
to
the
radius.
In
the
diagram
overleaf,
the
angle
A
in
radians
is
L/R.
The
circumference
of
a
circle
is
2n
times
its
radius
(21TR), so
it
follows
that
360
degrees
is
equivalent
to
21T
radians.

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Atari XL Specifications

General IconGeneral
BrandAtari
ModelXL
CategoryDesktop
LanguageEnglish

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