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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Boost.Python - <boost/python/numeric.hpp></title>
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<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
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<td valign="top" width="300">
<h3><a href="../../../../index.htm"><img height="86" width="277"
alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
</td>
<td valign="top">
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
<h2 align="center">Header <boost/python/numeric.hpp></h2>
</td>
</tr>
</table>
<hr>
<h2>Contents</h2>
<dl class="page-index">
<dt><a href="#introduction">Introduction</a></dt>
<dt><a href="#classes">Classes</a></dt>
<dd>
<dl class="page-index">
<dt><a href="#array-spec">Class <code>array</code></a></dt>
<dd>
<dl class="page-index">
<dt><a href="#array-spec-synopsis">Class <code>array</code>
synopsis</a></dt>
<dt><a href="#array-spec-observers">Class <code>array</code>
observer functions</a></dt>
<dt><a href="#array-spec-statics">Class <code>array</code>
static functions</a></dt>
</dl>
</dd>
</dl>
</dd>
<dt><a href="#examples">Example(s)</a></dt>
</dl>
<hr>
<h2><a name="introduction"></a>Introduction</h2>
<p>Exposes a <a href=
"ObjectWrapper.html#TypeWrapper-concept">TypeWrapper</a> for the Python
<a href=
"http://www.python.org/dev/doc/devel/lib/typesmapping.html">array</a>
type.</p>
<h2><a name="classes"></a>Classes</h2>
<h3><a name="array-spec"></a>Class <code>array</code></h3>
<p>Provides access to the array types of <a href=
"http://www.pfdubois.com/numpy/">Numerical Python</a>'s <a href=
"http://www.pfdubois.com/numpy/#Numeric">Numeric</a> and <a href=
"http://stsdas.stsci.edu/numarray/index.html">NumArray</a> modules. With
the exception of the functions documented <a href=
"#array-spec-observers">below</a>, the semantics of the constructors and
member functions defined below can be fully understood by reading the <a
href="ObjectWrapper.html#TypeWrapper-concept">TypeWrapper</a> concept
definition. Since <code>array</code> is publicly derived from <code><a
href="object.html#object-spec">object</a></code>, the public object
interface applies to <code>array</code> instances as well.</p>
<p><a name="default_search"></a>The default behavior is to use
<code>numarray.NDArray</code> as the associated Python type if the
<code>numarray</code> module is installed in the default location.
Otherwise it falls back to use <code>Numeric.ArrayType</code>. If neither
extension module is installed, conversions to arguments of type
<code>numeric::array</code> will cause overload resolution to reject the
overload, and other attempted uses of <code>numeric::array</code> will <a
href="definitions.html#raise">raise</a> an appropriate Python exception.
The associated Python type can be set manually using the <code><a href=
"#array-spec-statics">set_module_and_type</a>(...)</code> static
function.</p>
<h4><a name="array-spec-synopsis"></a>Class <code>array</code>
synopsis</h4>
<pre>
namespace boost { namespace python { namespace numeric
{
class array : public object
{
public:
object astype();
template <class Type>
object astype(Type const& type_);
template <class Type>
object new_(Type const& type_) const;
template <class Sequence>
void resize(Sequence const& x);
void resize(long x1);
void resize(long x1, long x2);
...
void resize(long x1, long x2,...long x<i>n</i>);
template <class Sequence>
void setshape(Sequence const& x);
void setshape(long x1);
void setshape(long x1, long x2);
...
void setshape(long x1, long x2,...long x<i>n</i>);
template <class Indices, class Values>
void put(Indices const& indices, Values const& values);
template <class Sequence>
object take(Sequence const& sequence, long axis = 0);
template <class File>
void tofile(File const& f) const;
object factory();
template <class Buffer>
object factory(Buffer const&);
template <class Buffer, class Type>
object factory(Buffer const&, Type const&);
template <class Buffer, class Type, class Shape>
object factory(Buffer const&, Type const&, Shape const&, bool copy = true, bool savespace = false);
template <class Buffer, class Type, class Shape>
object factory(Buffer const&, Type const&, Shape const&, bool copy, bool savespace, char typecode);
template <class T1>
explicit array(T1 const& x1);
template <class T1, class T2>
explicit array(T1 const& x1, T2 const& x2);
...
template <class T1, class T2,...class T<i>n</i>>
explicit array(T1 const& x1, T2 const& x2,...T<i>n</i> const& xn);
static void set_module_and_type();
static void set_module_and_type(char const* package_path = 0, char const* type_name = 0);
object argmax(long axis=-1);
object argmin(long axis=-1);
object argsort(long axis=-1);
void byteswap();
object copy() const;
object diagonal(long offset = 0, long axis1 = 0, long axis2 = 1) const;
void info() const;
bool is_c_array() const;
bool isbyteswapped() const;
void sort();
object trace(long offset = 0, long axis1 = 0, long axis2 = 1) const;
object type() const;
char typecode() const;
object getflat() const;
long getrank() const;
object getshape() const;
bool isaligned() const;
bool iscontiguous() const;
long itemsize() const;
long nelements() const;
object nonzero() const;
void ravel();
object repeat(object const& repeats, long axis=0);
void setflat(object const& flat);
void swapaxes(long axis1, long axis2);
str tostring() const;
void transpose(object const& axes = object());
object view() const;
};
}}}
</pre>
<h4><a name="array-spec-observers"></a>Class <code>array</code> observer
functions</h4>
<pre>
object factory();
template <class Buffer>
object factory(Buffer const&);
template <class Buffer, class Type>
object factory(Buffer const&, Type const&);
template <class Buffer, class Type, class Shape>
object factory(Buffer const&, Type const&, Shape const&, bool copy = true, bool savespace = false);
template <class Buffer, class Type, class Shape>
object factory(Buffer const&, Type const&, Shape const&, bool copy, bool savespace, char typecode);
</pre>
These functions map to the underlying array type's <code>array()</code>
function family. They are not called "<code>array</code>" because of the
C++ limitation that you can't define a member function with the same name
as its enclosing class.
<pre>
template <class Type>
object new_(Type const&) const;
</pre>
This function maps to the underlying array type's <code>new()</code>
function. It is not called "<code>new</code>" because that is a keyword
in C++.
<h4><a name="array-spec-statics"></a>Class <code>array</code> static
functions</h4>
<pre>
static void set_module_and_type(char const* package_path, char const* type_name);
static void set_module_and_type();
</pre>
<dl class="function-semantics">
<dt><b>Requires:</b> <code>package_path</code> and
<code>type_name</code>, if supplied, is an <a href=
"definitions.html#ntbs">ntbs</a>.</dt>
<dt><b>Effects:</b> The first form sets the package path of the module
which supplies the type named by <code>type_name</code> to
<code>package_path</code>. The second form restores the <a href=
"#default_search">default search behavior</a>. The associated Python
type will be searched for only the first time it is needed, and
thereafter the first time it is needed after an invocation of
<code>set_module_and_type</code>.</dt>
</dl>
<h2><a name="examples"></a>Example</h2>
<pre>
#include <boost/python/numeric.hpp>
#include <boost/python/tuple.hpp>
// sets the first element in a 2d numeric array
void set_first_element(numeric::array& y, double value)
{
y[make_tuple(0,0)] = value;
}
</pre>
<p>Revised 03 October, 2002</p>
<p><i>© Copyright <a href=
"../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002.</i></p>
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