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Ulm's Modula-2 Library:
MathLib

NAME

MathLib - mathematical library

SYNOPSIS

PROCEDURE arctan(x: REAL) : REAL;
PROCEDURE exp(x: REAL) : REAL;
PROCEDURE ln(x: REAL) : REAL;
PROCEDURE sin(x: REAL) : REAL;
PROCEDURE cos(x: REAL) : REAL;
PROCEDURE sqrt(x: REAL) : REAL;

DESCRIPTION

Arctan returns the arc tangent of x in the range -pi/2 to pi/2.

Exp returns the exponential function of x.

Ln returns the natural logarithm of x.

Sin and cos return trigonometric functions of radian arguments.

Sqrt returns the square root of x.

DIAGNOSTICS

The routines may return NaN (not-a-number) in case of domain errors or plus or minus infinity if the result value cannot be represented as REAL. Note that NaNs can be easily checked for by testing for equality on itself (returns FALSE), and plus infinity is larger than MAX(REAL). These checks, however, are not portable to platforms which do not conform to IEEE 754.

HISTORY

A similar module named MathLib0 was written by Niklaus Wirth for the Lilith system.

The current implementation has been derived by Andreas Borchert from the GNU C Library which itself has been partially derived from sources of the Regents of the University of California. The only exception is sqrt which is implemented on base of SYSTEM.SQRT.

Edited by: borchert, last change: 1997/02/25, revision: 1.2, converted to HTML: 1997/04/28