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<a href="mpi4py-module.html">Package mpi4py</a> ::
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Class Datatype
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class Datatype</h1><p class="nomargin-top"></p>
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Datatype
<!-- ==================== INSTANCE METHODS ==================== -->
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<td align="left"><span class="table-header">Instance Methods</span></td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a name="Commit"></a><span class="summary-sig-name">Commit</span>(<span class="summary-sig-arg">self</span>)</span><br />
Commit the datatype</td>
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<td><span class="summary-sig"><a name="Create_contiguous"></a><span class="summary-sig-name">Create_contiguous</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">int count</span>)</span><br />
Create a contiguous datatype</td>
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<td><span class="summary-sig"><a name="Create_darray"></a><span class="summary-sig-name">Create_darray</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">int size</span>,
<span class="summary-sig-arg">int rank</span>,
<span class="summary-sig-arg">gsizes</span>,
<span class="summary-sig-arg">distribs</span>,
<span class="summary-sig-arg">dargs</span>,
<span class="summary-sig-arg">psizes</span>,
<span class="summary-sig-arg">int order</span>=<span class="summary-sig-default">ORDER_C</span>)</span><br />
Create a datatype representing an HPF-like
distributed array on Cartesian process grids</td>
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<td><span class="summary-sig"><a name="Create_dup"></a><span class="summary-sig-name">Create_dup</span>(<span class="summary-sig-arg">self</span>)</span><br />
Duplicate a datatype</td>
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<td><span class="summary-sig"><a name="Create_f90_complex"></a><span class="summary-sig-name">Create_f90_complex</span>(<span class="summary-sig-arg">type cls</span>,
<span class="summary-sig-arg">int p</span>,
<span class="summary-sig-arg">int r</span>)</span><br />
Return a bounded complex datatype</td>
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<td><span class="summary-sig"><a name="Create_f90_integer"></a><span class="summary-sig-name">Create_f90_integer</span>(<span class="summary-sig-arg">type cls</span>,
<span class="summary-sig-arg">int r</span>)</span><br />
Return a bounded integer datatype</td>
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<td><span class="summary-sig"><a name="Create_f90_real"></a><span class="summary-sig-name">Create_f90_real</span>(<span class="summary-sig-arg">type cls</span>,
<span class="summary-sig-arg">int p</span>,
<span class="summary-sig-arg">int r</span>)</span><br />
Return a bounded real datatype</td>
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<td><span class="summary-sig"><a name="Create_hindexed"></a><span class="summary-sig-name">Create_hindexed</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">blocklengths</span>,
<span class="summary-sig-arg">displacements</span>)</span><br />
Create an indexed datatype
with displacements in bytes</td>
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<td><span class="summary-sig"><a name="Create_hvector"></a><span class="summary-sig-name">Create_hvector</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">int count</span>,
<span class="summary-sig-arg">int blocklength</span>,
<span class="summary-sig-arg">Aint stride</span>)</span><br />
Create a vector (strided) datatype</td>
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<td><span class="summary-sig"><a name="Create_indexed"></a><span class="summary-sig-name">Create_indexed</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">blocklengths</span>,
<span class="summary-sig-arg">displacements</span>)</span><br />
Create an indexed datatype</td>
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<td><span class="summary-sig"><a name="Create_indexed_block"></a><span class="summary-sig-name">Create_indexed_block</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">int blocklength</span>,
<span class="summary-sig-arg">displacements</span>)</span><br />
Create an indexed datatype
with constant-sized blocks</td>
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<td><span class="summary-sig"><a name="Create_resized"></a><span class="summary-sig-name">Create_resized</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">Aint lb</span>,
<span class="summary-sig-arg">Aint extent</span>)</span><br />
Create a datatype with a new lower bound and extent</td>
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<td><span class="summary-sig"><a name="Create_struct"></a><span class="summary-sig-name">Create_struct</span>(<span class="summary-sig-arg">type cls</span>,
<span class="summary-sig-arg">blocklengths</span>,
<span class="summary-sig-arg">displacements</span>,
<span class="summary-sig-arg">datatypes</span>)</span><br />
Create an datatype from a general set of
block sizes, displacements and datatypes</td>
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<td><span class="summary-sig"><a name="Create_subarray"></a><span class="summary-sig-name">Create_subarray</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">sizes</span>,
<span class="summary-sig-arg">subsizes</span>,
<span class="summary-sig-arg">starts</span>,
<span class="summary-sig-arg">int order</span>=<span class="summary-sig-default">ORDER_C</span>)</span><br />
Create a datatype for a subarray of
a regular, multidimensional array</td>
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<td><span class="summary-sig"><a name="Create_vector"></a><span class="summary-sig-name">Create_vector</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">int count</span>,
<span class="summary-sig-arg">int blocklength</span>,
<span class="summary-sig-arg">int stride</span>)</span><br />
Create a vector (strided) datatype</td>
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<td><span class="summary-sig"><a name="Dup"></a><span class="summary-sig-name">Dup</span>(<span class="summary-sig-arg">self</span>)</span><br />
Duplicate a datatype</td>
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<td><span class="summary-sig"><a name="Free"></a><span class="summary-sig-name">Free</span>(<span class="summary-sig-arg">self</span>)</span><br />
Free the datatype</td>
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<td><span class="summary-sig"><a name="Get_attr"></a><span class="summary-sig-name">Get_attr</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">int keyval</span>)</span><br />
Retrieve attribute value by key</td>
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<td><span class="summary-sig"><a name="Get_contents"></a><span class="summary-sig-name">Get_contents</span>(<span class="summary-sig-arg">self</span>)</span><br />
Retrieve the actual arguments used in the call that created a
datatype</td>
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<td><span class="summary-sig"><a name="Get_envelope"></a><span class="summary-sig-name">Get_envelope</span>(<span class="summary-sig-arg">self</span>)</span><br />
Return information on the number and type of input arguments
used in the call that created a datatype</td>
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<td><span class="summary-sig"><a name="Get_extent"></a><span class="summary-sig-name">Get_extent</span>(<span class="summary-sig-arg">self</span>)</span><br />
Return lower bound and extent of datatype</td>
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<td><span class="summary-sig"><a name="Get_name"></a><span class="summary-sig-name">Get_name</span>(<span class="summary-sig-arg">self</span>)</span><br />
Get the print name for this datatype</td>
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<td><span class="summary-sig"><a name="Get_size"></a><span class="summary-sig-name">Get_size</span>(<span class="summary-sig-arg">self</span>)</span><br />
Return the number of bytes occupied
by entries in the datatype</td>
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<td><span class="summary-sig"><a name="Get_true_extent"></a><span class="summary-sig-name">Get_true_extent</span>(<span class="summary-sig-arg">self</span>)</span><br />
Return the true lower bound and extent of a datatype</td>
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<td><span class="summary-sig"><a name="Match_size"></a><span class="summary-sig-name">Match_size</span>(<span class="summary-sig-arg">type cls</span>,
<span class="summary-sig-arg">int typeclass</span>,
<span class="summary-sig-arg">int size</span>)</span><br />
Find a datatype matching a specified size in bytes</td>
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<td><span class="summary-sig"><a name="Pack"></a><span class="summary-sig-name">Pack</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">inbuf</span>,
<span class="summary-sig-arg">outbuf</span>,
<span class="summary-sig-arg">int position</span>,
<span class="summary-sig-arg">Comm comm</span>)</span><br />
Pack into contiguous memory according to datatype.</td>
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<td width="15%" align="right" valign="top" class="summary">
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<td><span class="summary-sig"><a name="Pack_external"></a><span class="summary-sig-name">Pack_external</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">datarep</span>,
<span class="summary-sig-arg">inbuf</span>,
<span class="summary-sig-arg">outbuf</span>,
<span class="summary-sig-arg">Aint position</span>)</span><br />
Pack into contiguous memory according to datatype,
using a portable data representation (<strong>external32</strong>).</td>
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<td><span class="summary-sig"><a name="Pack_external_size"></a><span class="summary-sig-name">Pack_external_size</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">datarep</span>,
<span class="summary-sig-arg">int count</span>)</span><br />
Returns the upper bound on the amount of space (in bytes)
needed to pack a message according to datatype,
using a portable data representation (<strong>external32</strong>).</td>
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<td><span class="summary-sig"><a name="Pack_size"></a><span class="summary-sig-name">Pack_size</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">int count</span>,
<span class="summary-sig-arg">Comm comm</span>)</span><br />
Returns the upper bound on the amount of space (in bytes)
needed to pack a message according to datatype.</td>
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<td><span class="summary-sig"><a name="Resized"></a><span class="summary-sig-name">Resized</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">Aint lb</span>,
<span class="summary-sig-arg">Aint extent</span>)</span><br />
Create a datatype with a new lower bound and extent</td>
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<td><span class="summary-sig"><a name="Set_name"></a><span class="summary-sig-name">Set_name</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">name</span>)</span><br />
Set the print name for this datatype</td>
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<td><span class="summary-sig"><a name="Unpack"></a><span class="summary-sig-name">Unpack</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">inbuf</span>,
<span class="summary-sig-arg">int position</span>,
<span class="summary-sig-arg">outbuf</span>,
<span class="summary-sig-arg">Comm comm</span>)</span><br />
Unpack from contiguous memory according to datatype.</td>
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</td>
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<span class="summary-type"> </span>
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<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a name="Unpack_external"></a><span class="summary-sig-name">Unpack_external</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">datarep</span>,
<span class="summary-sig-arg">inbuf</span>,
<span class="summary-sig-arg">Aint position</span>,
<span class="summary-sig-arg">outbuf</span>)</span><br />
Unpack from contiguous memory according to datatype,
using a portable data representation (<strong>external32</strong>).</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a name="__eq__"></a><span class="summary-sig-name">__eq__</span>(<span class="summary-sig-arg">y</span>)</span><br />
x==y</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a name="__ge__"></a><span class="summary-sig-name">__ge__</span>(<span class="summary-sig-arg">y</span>)</span><br />
x>=y</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a name="__gt__"></a><span class="summary-sig-name">__gt__</span>(<span class="summary-sig-arg">y</span>)</span><br />
x>y</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a name="__le__"></a><span class="summary-sig-name">__le__</span>(<span class="summary-sig-arg">y</span>)</span><br />
x<=y</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a name="__lt__"></a><span class="summary-sig-name">__lt__</span>(<span class="summary-sig-arg">y</span>)</span><br />
x<y</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a name="__ne__"></a><span class="summary-sig-name">__ne__</span>(<span class="summary-sig-arg">y</span>)</span><br />
x!=y</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type">a new object with type S, a subtype of T</span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a href="mpi4py.MPI.Datatype-class.html#__new__" class="summary-sig-name">__new__</a>(<span class="summary-sig-arg">S</span>,
<span class="summary-sig-arg">...</span>)</span></td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a name="__nonzero__"></a><span class="summary-sig-name">__nonzero__</span>()</span><br />
x != 0</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a name="decode"></a><span class="summary-sig-name">decode</span>(<span class="summary-sig-arg">self</span>)</span><br />
Convenience method for decoding a datatype</td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a name="f2py"></a><span class="summary-sig-name">f2py</span>(<span class="summary-sig-arg">type cls</span>,
<span class="summary-sig-arg">arg</span>)</span></td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td><span class="summary-sig"><a name="py2f"></a><span class="summary-sig-name">py2f</span>(<span class="summary-sig-arg">self</span>)</span></td>
<td align="right" valign="top">
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td colspan="2" class="summary">
<p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
<code>__delattr__</code>,
<code>__format__</code>,
<code>__getattribute__</code>,
<code>__hash__</code>,
<code>__init__</code>,
<code>__reduce__</code>,
<code>__reduce_ex__</code>,
<code>__repr__</code>,
<code>__setattr__</code>,
<code>__sizeof__</code>,
<code>__str__</code>,
<code>__subclasshook__</code>
</p>
</td>
</tr>
</table>
<!-- ==================== PROPERTIES ==================== -->
<a name="section-Properties"></a>
<table class="summary" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="table-header">
<td colspan="2" class="table-header">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr valign="top">
<td align="left"><span class="table-header">Properties</span></td>
<td align="right" valign="top"
><span class="options">[<a href="#section-Properties"
class="privatelink" onclick="toggle_private();"
>hide private</a>]</span></td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a name="extent"></a><span class="summary-name">extent</span><br />
extent
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a name="lb"></a><span class="summary-name">lb</span><br />
lower bound
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a name="name"></a><span class="summary-name">name</span><br />
datatype name
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a name="size"></a><span class="summary-name">size</span><br />
size (in bytes)
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a name="true_extent"></a><span class="summary-name">true_extent</span><br />
true extent
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a name="true_lb"></a><span class="summary-name">true_lb</span><br />
true lower bound
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a name="true_ub"></a><span class="summary-name">true_ub</span><br />
true upper bound
</td>
</tr>
<tr>
<td width="15%" align="right" valign="top" class="summary">
<span class="summary-type"> </span>
</td><td class="summary">
<a name="ub"></a><span class="summary-name">ub</span><br />
upper bound
</td>
</tr>
<tr>
<td colspan="2" class="summary">
<p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
<code>__class__</code>
</p>
</td>
</tr>
</table>
<!-- ==================== METHOD DETAILS ==================== -->
<a name="section-MethodDetails"></a>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="table-header">
<td colspan="2" class="table-header">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr valign="top">
<td align="left"><span class="table-header">Method Details</span></td>
<td align="right" valign="top"
><span class="options">[<a href="#section-MethodDetails"
class="privatelink" onclick="toggle_private();"
>hide private</a>]</span></td>
</tr>
</table>
</td>
</tr>
</table>
<a name="__new__"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">__new__</span>(<span class="sig-arg">S</span>,
<span class="sig-arg">...</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<dl class="fields">
<dt>Returns: a new object with type S, a subtype of T</dt>
<dt>Overrides:
object.__new__
</dt>
</dl>
</td></tr></table>
</div>
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