blob: 314db20ec5dbff14c41e85d1d20ec333b9d7ec3b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
\section{Built-in Module \sectcode{cmath}}
\label{module-cmath}
\bimodindex{cmath}
\renewcommand{\indexsubitem}{(in module cmath)}
This module is always available.
It provides access to mathematical functions for complex numbers.
The functions are:
\begin{funcdesc}{acos}{x}
Return the arc cosine of \var{x}.
\end{funcdesc}
\begin{funcdesc}{acosh}{x}
Return the hyperbolic arc cosine of \var{x}.
\end{funcdesc}
\begin{funcdesc}{asin}{x}
Return the arc sine of \var{x}.
\end{funcdesc}
\begin{funcdesc}{asinh}{x}
Return the hyperbolic arc sine of \var{x}.
\end{funcdesc}
\begin{funcdesc}{atan}{x}
Return the arc tangent of \var{x}.
\end{funcdesc}
\begin{funcdesc}{atanh}{x}
Return the hyperbolic arc tangent of \var{x}.
\end{funcdesc}
\begin{funcdesc}{cos}{x}
Return the cosine of \var{x}.
\end{funcdesc}
\begin{funcdesc}{cosh}{x}
Return the hyperbolic cosine of \var{x}.
\end{funcdesc}
\begin{funcdesc}{exp}{x}
Return the exponential value $\mbox{e}^x$.
\end{funcdesc}
\begin{funcdesc}{log}{x}
Return the natural logarithm of \var{x}.
\end{funcdesc}
\begin{funcdesc}{log10}{x}
Return the base-10 logarithm of \var{x}.
\end{funcdesc}
\begin{funcdesc}{sin}{x}
Return the sine of \var{x}.
\end{funcdesc}
\begin{funcdesc}{sinh}{x}
Return the hyperbolic sine of \var{x}.
\end{funcdesc}
\begin{funcdesc}{sqrt}{x}
Return the square root of \var{x}.
\end{funcdesc}
\begin{funcdesc}{tan}{x}
Return the tangent of \var{x}.
\end{funcdesc}
\begin{funcdesc}{tanh}{x}
Return the hyperbolic tangent of \var{x}.
\end{funcdesc}
The module also defines two mathematical constants:
\begin{datadesc}{pi}
The mathematical constant \emph{pi}, as a real.
\end{datadesc}
\begin{datadesc}{e}
The mathematical constant \emph{e}, as a real.
\end{datadesc}
Note that the selection of functions is similar, but not identical, to
that in module \code{math}. The reason for having two modules is,
that some users aren't interested in complex numbers, and perhaps
don't even know what they are. They would rather have \code{math.sqrt(-1)}
raise an exception than return a complex number. Also note that the
functions defined in \code{cmath} always return a complex number, even
if the answer can be expressed as a real number (in which case the
complex number has an imaginary part of zero).
|
