Subversion Repositories planix.SVN

Rev

Rev 34 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
2 - 1 
.TH EXP 2
2 
.SH NAME
3 
exp, log, log10, pow, pow10, sqrt \- exponential, logarithm, power, square root
4 
.SH SYNOPSIS
5 
.B #include <u.h>
6 
.br
7 
.B #include <libc.h>
8 
.PP
9 
.nf
10 
.B
11 
double exp(double x)
12 
.PP
13 
.B
14 
double log(double x)
15 
.PP
16 
.B
17 
double log10(double x)
18 
.PP
19 
.B
20 
double pow(double x, double y)
21 
.PP
22 
.B
23 
double pow10(int n)
24 
.PP
25 
.B
26 
double sqrt(double x)
27 
.fi
28 
.SH DESCRIPTION
29 
.I Exp
30 
returns the exponential function of
31 
.IR x .
32 
.PP
33 
.I Log
34 
returns the natural logarithm of
35 
.IR x ;
36 
.I log10
37 
returns the base 10 logarithm.
38 
.PP
39 
.I Pow
40 
returns
41 
.if t .I  x\u\s8y\s10\d
42 
.if n x^y,
43 
and
44 
.I pow10
45 
returns
46 
.if t .I  10\u\s8n\s10\d
47 
.if n 10^n
48 
as a double.
49 
.PP
50 
.I Sqrt
51 
returns the square root of
52 
.IR x .
53 
.SH SOURCE
54 
All these routines have portable C implementations in
55 
.BR /sys/src/libc/port .
56 
Most also have machine-dependent implementations, written either in assembler
57 
or C, in
58 
.BR /sys/src/libc/$objtype .
59 
.SH SEE ALSO
60 
.IR hypot (2),
61 
.IR sinh (2),
62 
.IR intro (2)