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<div class="section" id="module-cmath">
<h1>9.3. <tt class="xref docutils literal"><span class="pre">cmath</span></tt> — Mathematical functions for complex numbers<a class="headerlink" href="#module-cmath" title="Permalink to this headline">¶</a></h1>
<p>This module is always available. It provides access to mathematical functions
for complex numbers. The functions in this module accept integers,
floating-point numbers or complex numbers as arguments. They will also accept
any Python object that has either a <a title="object.__complex__" class="reference external" href="../reference/datamodel.html#object.__complex__"><tt class="xref docutils literal"><span class="pre">__complex__()</span></tt></a> or a <a title="object.__float__" class="reference external" href="../reference/datamodel.html#object.__float__"><tt class="xref docutils literal"><span class="pre">__float__()</span></tt></a>
method: these methods are used to convert the object to a complex or
floating-point number, respectively, and the function is then applied to the
result of the conversion.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">On platforms with hardware and system-level support for signed
zeros, functions involving branch cuts are continuous on <em>both</em>
sides of the branch cut: the sign of the zero distinguishes one
side of the branch cut from the other. On platforms that do not
support signed zeros the continuity is as specified below.</p>
</div>
<div class="section" id="conversions-to-and-from-polar-coordinates">
<h2>9.3.1. Conversions to and from polar coordinates<a class="headerlink" href="#conversions-to-and-from-polar-coordinates" title="Permalink to this headline">¶</a></h2>
<p>A Python complex number <tt class="docutils literal"><span class="pre">z</span></tt> is stored internally using <em>rectangular</em>
or <em>Cartesian</em> coordinates. It is completely determined by its <em>real
part</em> <tt class="docutils literal"><span class="pre">z.real</span></tt> and its <em>imaginary part</em> <tt class="docutils literal"><span class="pre">z.imag</span></tt>. In other
words:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">z</span> <span class="o">==</span> <span class="n">z</span><span class="o">.</span><span class="n">real</span> <span class="o">+</span> <span class="n">z</span><span class="o">.</span><span class="n">imag</span><span class="o">*</span><span class="mi">1</span><span class="n">j</span>
</pre></div>
</div>
<p><em>Polar coordinates</em> give an alternative way to represent a complex
number. In polar coordinates, a complex number <em>z</em> is defined by the
modulus <em>r</em> and the phase angle <em>phi</em>. The modulus <em>r</em> is the distance
from <em>z</em> to the origin, while the phase <em>phi</em> is the counterclockwise
angle, measured in radians, from the positive x-axis to the line
segment that joins the origin to <em>z</em>.</p>
<p>The following functions can be used to convert from the native
rectangular coordinates to polar coordinates and back.</p>
<dl class="function">
<dt id="cmath.phase">
<tt class="descclassname">cmath.</tt><tt class="descname">phase</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.phase" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the phase of <em>x</em> (also known as the <em>argument</em> of <em>x</em>), as a
float. <tt class="docutils literal"><span class="pre">phase(x)</span></tt> is equivalent to <tt class="docutils literal"><span class="pre">math.atan2(x.imag,</span>
<span class="pre">x.real)</span></tt>. The result lies in the range [-π, π], and the branch
cut for this operation lies along the negative real axis,
continuous from above. On systems with support for signed zeros
(which includes most systems in current use), this means that the
sign of the result is the same as the sign of <tt class="docutils literal"><span class="pre">x.imag</span></tt>, even when
<tt class="docutils literal"><span class="pre">x.imag</span></tt> is zero:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">phase</span><span class="p">(</span><span class="nb">complex</span><span class="p">(</span><span class="o">-</span><span class="mf">1.0</span><span class="p">,</span> <span class="mf">0.0</span><span class="p">))</span>
<span class="go">3.1415926535897931</span>
<span class="gp">>>> </span><span class="n">phase</span><span class="p">(</span><span class="nb">complex</span><span class="p">(</span><span class="o">-</span><span class="mf">1.0</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.0</span><span class="p">))</span>
<span class="go">-3.1415926535897931</span>
</pre></div>
</div>
<p class="versionadded">
<span class="versionmodified">New in version 2.6.</span></p>
</dd></dl>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The modulus (absolute value) of a complex number <em>x</em> can be
computed using the built-in <a title="abs" class="reference external" href="functions.html#abs"><tt class="xref docutils literal"><span class="pre">abs()</span></tt></a> function. There is no
separate <tt class="xref docutils literal"><span class="pre">cmath</span></tt> module function for this operation.</p>
</div>
<dl class="function">
<dt id="cmath.polar">
<tt class="descclassname">cmath.</tt><tt class="descname">polar</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.polar" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the representation of <em>x</em> in polar coordinates. Returns a
pair <tt class="docutils literal"><span class="pre">(r,</span> <span class="pre">phi)</span></tt> where <em>r</em> is the modulus of <em>x</em> and phi is the
phase of <em>x</em>. <tt class="docutils literal"><span class="pre">polar(x)</span></tt> is equivalent to <tt class="docutils literal"><span class="pre">(abs(x),</span>
<span class="pre">phase(x))</span></tt>.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.6.</span></p>
</dd></dl>
<dl class="function">
<dt id="cmath.rect">
<tt class="descclassname">cmath.</tt><tt class="descname">rect</tt><big>(</big><em>r</em>, <em>phi</em><big>)</big><a class="headerlink" href="#cmath.rect" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the complex number <em>x</em> with polar coordinates <em>r</em> and <em>phi</em>.
Equivalent to <tt class="docutils literal"><span class="pre">r</span> <span class="pre">*</span> <span class="pre">(math.cos(phi)</span> <span class="pre">+</span> <span class="pre">math.sin(phi)*1j)</span></tt>.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.6.</span></p>
</dd></dl>
</div>
<div class="section" id="power-and-logarithmic-functions">
<h2>9.3.2. Power and logarithmic functions<a class="headerlink" href="#power-and-logarithmic-functions" title="Permalink to this headline">¶</a></h2>
<dl class="function">
<dt id="cmath.exp">
<tt class="descclassname">cmath.</tt><tt class="descname">exp</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.exp" title="Permalink to this definition">¶</a></dt>
<dd>Return the exponential value <tt class="docutils literal"><span class="pre">e**x</span></tt>.</dd></dl>
<dl class="function">
<dt id="cmath.log">
<tt class="descclassname">cmath.</tt><tt class="descname">log</tt><big>(</big><em>x</em><span class="optional">[</span>, <em>base</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#cmath.log" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns the logarithm of <em>x</em> to the given <em>base</em>. If the <em>base</em> is not
specified, returns the natural logarithm of <em>x</em>. There is one branch cut, from 0
along the negative real axis to -∞, continuous from above.</p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.4: </span><em>base</em> argument added.</p>
</dd></dl>
<dl class="function">
<dt id="cmath.log10">
<tt class="descclassname">cmath.</tt><tt class="descname">log10</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.log10" title="Permalink to this definition">¶</a></dt>
<dd>Return the base-10 logarithm of <em>x</em>. This has the same branch cut as
<a title="cmath.log" class="reference internal" href="#cmath.log"><tt class="xref docutils literal"><span class="pre">log()</span></tt></a>.</dd></dl>
<dl class="function">
<dt id="cmath.sqrt">
<tt class="descclassname">cmath.</tt><tt class="descname">sqrt</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.sqrt" title="Permalink to this definition">¶</a></dt>
<dd>Return the square root of <em>x</em>. This has the same branch cut as <a title="cmath.log" class="reference internal" href="#cmath.log"><tt class="xref docutils literal"><span class="pre">log()</span></tt></a>.</dd></dl>
</div>
<div class="section" id="trigonometric-functions">
<h2>9.3.3. Trigonometric functions<a class="headerlink" href="#trigonometric-functions" title="Permalink to this headline">¶</a></h2>
<dl class="function">
<dt id="cmath.acos">
<tt class="descclassname">cmath.</tt><tt class="descname">acos</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.acos" title="Permalink to this definition">¶</a></dt>
<dd>Return the arc cosine of <em>x</em>. There are two branch cuts: One extends right from
1 along the real axis to ∞, continuous from below. The other extends left from
-1 along the real axis to -∞, continuous from above.</dd></dl>
<dl class="function">
<dt id="cmath.asin">
<tt class="descclassname">cmath.</tt><tt class="descname">asin</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.asin" title="Permalink to this definition">¶</a></dt>
<dd>Return the arc sine of <em>x</em>. This has the same branch cuts as <a title="cmath.acos" class="reference internal" href="#cmath.acos"><tt class="xref docutils literal"><span class="pre">acos()</span></tt></a>.</dd></dl>
<dl class="function">
<dt id="cmath.atan">
<tt class="descclassname">cmath.</tt><tt class="descname">atan</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.atan" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the arc tangent of <em>x</em>. There are two branch cuts: One extends from
<tt class="docutils literal"><span class="pre">1j</span></tt> along the imaginary axis to <tt class="docutils literal"><span class="pre">∞j</span></tt>, continuous from the right. The
other extends from <tt class="docutils literal"><span class="pre">-1j</span></tt> along the imaginary axis to <tt class="docutils literal"><span class="pre">-∞j</span></tt>, continuous
from the left.</p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.6: </span>direction of continuity of upper cut reversed</p>
</dd></dl>
<dl class="function">
<dt id="cmath.cos">
<tt class="descclassname">cmath.</tt><tt class="descname">cos</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.cos" title="Permalink to this definition">¶</a></dt>
<dd>Return the cosine of <em>x</em>.</dd></dl>
<dl class="function">
<dt id="cmath.sin">
<tt class="descclassname">cmath.</tt><tt class="descname">sin</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.sin" title="Permalink to this definition">¶</a></dt>
<dd>Return the sine of <em>x</em>.</dd></dl>
<dl class="function">
<dt id="cmath.tan">
<tt class="descclassname">cmath.</tt><tt class="descname">tan</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.tan" title="Permalink to this definition">¶</a></dt>
<dd>Return the tangent of <em>x</em>.</dd></dl>
</div>
<div class="section" id="hyperbolic-functions">
<h2>9.3.4. Hyperbolic functions<a class="headerlink" href="#hyperbolic-functions" title="Permalink to this headline">¶</a></h2>
<dl class="function">
<dt id="cmath.acosh">
<tt class="descclassname">cmath.</tt><tt class="descname">acosh</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.acosh" title="Permalink to this definition">¶</a></dt>
<dd>Return the hyperbolic arc cosine of <em>x</em>. There is one branch cut, extending left
from 1 along the real axis to -∞, continuous from above.</dd></dl>
<dl class="function">
<dt id="cmath.asinh">
<tt class="descclassname">cmath.</tt><tt class="descname">asinh</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.asinh" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the hyperbolic arc sine of <em>x</em>. There are two branch cuts:
One extends from <tt class="docutils literal"><span class="pre">1j</span></tt> along the imaginary axis to <tt class="docutils literal"><span class="pre">∞j</span></tt>,
continuous from the right. The other extends from <tt class="docutils literal"><span class="pre">-1j</span></tt> along
the imaginary axis to <tt class="docutils literal"><span class="pre">-∞j</span></tt>, continuous from the left.</p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.6: </span>branch cuts moved to match those recommended by the C99 standard</p>
</dd></dl>
<dl class="function">
<dt id="cmath.atanh">
<tt class="descclassname">cmath.</tt><tt class="descname">atanh</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.atanh" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the hyperbolic arc tangent of <em>x</em>. There are two branch cuts: One
extends from <tt class="docutils literal"><span class="pre">1</span></tt> along the real axis to <tt class="docutils literal"><span class="pre">∞</span></tt>, continuous from below. The
other extends from <tt class="docutils literal"><span class="pre">-1</span></tt> along the real axis to <tt class="docutils literal"><span class="pre">-∞</span></tt>, continuous from
above.</p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.6: </span>direction of continuity of right cut reversed</p>
</dd></dl>
<dl class="function">
<dt id="cmath.cosh">
<tt class="descclassname">cmath.</tt><tt class="descname">cosh</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.cosh" title="Permalink to this definition">¶</a></dt>
<dd>Return the hyperbolic cosine of <em>x</em>.</dd></dl>
<dl class="function">
<dt id="cmath.sinh">
<tt class="descclassname">cmath.</tt><tt class="descname">sinh</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.sinh" title="Permalink to this definition">¶</a></dt>
<dd>Return the hyperbolic sine of <em>x</em>.</dd></dl>
<dl class="function">
<dt id="cmath.tanh">
<tt class="descclassname">cmath.</tt><tt class="descname">tanh</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.tanh" title="Permalink to this definition">¶</a></dt>
<dd>Return the hyperbolic tangent of <em>x</em>.</dd></dl>
</div>
<div class="section" id="classification-functions">
<h2>9.3.5. Classification functions<a class="headerlink" href="#classification-functions" title="Permalink to this headline">¶</a></h2>
<dl class="function">
<dt id="cmath.isinf">
<tt class="descclassname">cmath.</tt><tt class="descname">isinf</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.isinf" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <em>True</em> if the real or the imaginary part of x is positive
or negative infinity.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.6.</span></p>
</dd></dl>
<dl class="function">
<dt id="cmath.isnan">
<tt class="descclassname">cmath.</tt><tt class="descname">isnan</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#cmath.isnan" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <em>True</em> if the real or imaginary part of x is not a number (NaN).</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.6.</span></p>
</dd></dl>
</div>
<div class="section" id="constants">
<h2>9.3.6. Constants<a class="headerlink" href="#constants" title="Permalink to this headline">¶</a></h2>
<dl class="data">
<dt id="cmath.pi">
<tt class="descclassname">cmath.</tt><tt class="descname">pi</tt><a class="headerlink" href="#cmath.pi" title="Permalink to this definition">¶</a></dt>
<dd>The mathematical constant <em>π</em>, as a float.</dd></dl>
<dl class="data">
<dt id="cmath.e">
<tt class="descclassname">cmath.</tt><tt class="descname">e</tt><a class="headerlink" href="#cmath.e" title="Permalink to this definition">¶</a></dt>
<dd>The mathematical constant <em>e</em>, as a float.</dd></dl>
<p id="index-237">Note that the selection of functions is similar, but not identical, to that in
module <a title="Mathematical functions (sin() etc.)." class="reference external" href="math.html#module-math"><tt class="xref docutils literal"><span class="pre">math</span></tt></a>. 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 <tt class="docutils literal"><span class="pre">math.sqrt(-1)</span></tt> raise an exception than return a complex
number. Also note that the functions defined in <tt class="xref docutils literal"><span class="pre">cmath</span></tt> 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).</p>
<p>A note on branch cuts: They are curves along which the given function fails to
be continuous. They are a necessary feature of many complex functions. It is
assumed that if you need to compute with complex functions, you will understand
about branch cuts. Consult almost any (not too elementary) book on complex
variables for enlightenment. For information of the proper choice of branch
cuts for numerical purposes, a good reference should be the following:</p>
<div class="admonition-see-also admonition seealso">
<p class="first admonition-title">See also</p>
<p class="last">Kahan, W: Branch cuts for complex elementary functions; or, Much ado about
nothing’s sign bit. In Iserles, A., and Powell, M. (eds.), The state of the art
in numerical analysis. Clarendon Press (1987) pp165-211.</p>
</div>
</div>
</div>
</div>
</div>
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<h3><a href="../contents.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference external" href="#">9.3. <tt class="docutils literal"><span class="pre">cmath</span></tt> — Mathematical functions for complex numbers</a><ul>
<li><a class="reference external" href="#conversions-to-and-from-polar-coordinates">9.3.1. Conversions to and from polar coordinates</a></li>
<li><a class="reference external" href="#power-and-logarithmic-functions">9.3.2. Power and logarithmic functions</a></li>
<li><a class="reference external" href="#trigonometric-functions">9.3.3. Trigonometric functions</a></li>
<li><a class="reference external" href="#hyperbolic-functions">9.3.4. Hyperbolic functions</a></li>
<li><a class="reference external" href="#classification-functions">9.3.5. Classification functions</a></li>
<li><a class="reference external" href="#constants">9.3.6. Constants</a></li>
</ul>
</li>
</ul>
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