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.help mathfcns Feb86 language
.ih
NAME
mathfcns -- math functions available in the CL
.ih
SYNOPSIS
.nf
Function Return value Description
sin(x) real sine
cos(x) real cosine
tan(x) real tangent
atan2(x,y) real arc-tangent
exp(x) real e**x
log(x) real natural logarithm
log10(x) real common logarithm
frac(x) real fractional part
abs(x) type of argument absolute value
min(a,b,...) type of min. arg minimum of a list of values
max(a,b,...) type of max. arg maximum of a list of values
real(x) real convert to real
int(x) integer integer part
.fi
.ih
DESCRIPTION
A number of mathematical functions are available under the CL. In general
they return real values and may be used wherever a real expression is
valid. The input arguments may be integer or real and may be mixed in
cases where the function has more than one argument.
Exceptions:
.nf
abs(x) returns real or integer depending on its argument
int(x) returns an integer
min,max return a copy of the min/max operand, no type change
.fi
Note that the intrinsic functions \fIint\fR and \fIreal\fR may be called
to decode string valued arguments.
.ih
EXAMPLES
.nf
y = sin (x)
= 180 / 3.1415927 * atan2 (x, y)
i = int (max (4.3, x, y, 2))
= 1. - (sin(.5)**2 + cos(.5)**2)
.fi
.ih
BUGS
An invalid argument list to a math function (e.g. log(-1)) will terminate
a script.
.ih
SEE ALSO
strings
.endhelp
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