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annotate Doc/libcmath.tex @ 5817:48b94de85bf3 legacy-trunk

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author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
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1 \section{Built-in Module \sectcode{cmath}}
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2 \label{module-cmath}
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3
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4 \bimodindex{cmath}
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5 \renewcommand{\indexsubitem}{(in module cmath)}
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6 This module is always available.
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7 It provides access to mathematical functions for complex numbers.
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8 The functions are:
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9 \iftexi
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10 \begin{funcdesc}{acos}{x}
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11 \funcline{asin}{x}
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12 \funcline{atan}{x}
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13 \funcline{cos}{x}
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14 \funcline{cosh}{x}
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15 \funcline{exp}{x}
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16 \funcline{log}{x}
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17 \funcline{log10}{x}
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18 \funcline{sin}{x}
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19 \funcline{sinh}{x}
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20 \funcline{sqrt}{x}
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21 \funcline{tan}{x}
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22 \funcline{tanh}{x}
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23 \end{funcdesc}
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24 \else
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25 \code{acos(\varvars{x})},
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26 \code{acosh(\varvars{x})},
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27 \code{asin(\varvars{x})},
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28 \code{asinh(\varvars{x})},
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29 \code{atan(\varvars{x})},
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30 \code{atanh(\varvars{x})},
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31 \code{cos(\varvars{x})},
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32 \code{cosh(\varvars{x})},
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33 \code{exp(\varvars{x})},
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34 \code{log(\varvars{x})},
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35 \code{log10(\varvars{x})},
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36 \code{sin(\varvars{x})},
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37 \code{sinh(\varvars{x})},
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38 \code{sqrt(\varvars{x})},
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39 \code{tan(\varvars{x})},
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40 \code{tanh(\varvars{x})}.
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41 \fi
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42
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43 The module also defines two mathematical constants:
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44 \iftexi
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45 \begin{datadesc}{pi}
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46 \dataline{e}
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47 \end{datadesc}
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48 \else
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49 \code{pi} and \code{e}.
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50 \fi
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51
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52 Note that the selection of functions is similar, but not identical, to
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53 that in module \code{math}. The reason for having two modules is,
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54 that some users aren't interested in complex numbers, and perhaps
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55 don't even know what they are. They would rather have \code{math.sqrt(-1)}
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56 raise an exception than return a complex number. Also note that the
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57 functions defined in \code{cmath} always return a complex number, even
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58 if the answer can be expressed as a real number (in which case the
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59 complex number has an imaginary part of zero).