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<?xml version="1.0" encoding="ascii"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>netCDF3.Variable</title>
<link rel="stylesheet" href="epydoc.css" type="text/css" />
<script type="text/javascript" src="epydoc.js"></script>
</head>
<body bgcolor="white" text="black" link="blue" vlink="#204080"
alink="#204080">
<!-- ==================== NAVIGATION BAR ==================== -->
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bgcolor="#a0c0ff" cellspacing="0">
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href="module-tree.html">Trees</a> </th>
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href="identifier-index.html">Indices</a> </th>
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<th> <a
href="help.html">Help</a> </th>
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<span class="breadcrumbs">
<a href="netCDF3-module.html">Module netCDF3</a> ::
Class Variable
</span>
</td>
<td>
<table cellpadding="0" cellspacing="0">
<!-- hide/show private -->
</table>
</td>
</tr>
</table>
<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class Variable</h1><p class="nomargin-top"></p>
<pre class="base-tree">
object --+
|
<strong class="uidshort">Variable</strong>
</pre>
<hr />
<p>Variable(self, dset, name, datatype, dimensions=(),
fill_value=None)</p>
<p>A netCDF <a href="netCDF3.Variable-class.html"
class="link">Variable</a> is used to read and write netCDF data. They
are analagous to numpy array objects.</p>
<p><a href="netCDF3.Variable-class.html" class="link">Variable</a>
instances should be created using the <a
href="netCDF3.Dataset-class.html#createVariable"
class="link">createVariable</a> method of a <a
href="netCDF3.Dataset-class.html" class="link">Dataset</a> instance, not
using this class directly.</p>
<p><b>Parameters:</b></p>
<p><b><code>dset</code></b> - Dataset instance.</p>
<p><b><code>name</code></b> - Name of the variable.</p>
<p><b><code>datatype</code></b> - <a href="netCDF3.Variable-class.html"
class="link">Variable</a> data type. Can be specified by providing a
numpy dtype object, or a string that describes a numpy dtype object.
Supported values, corresponding to <code>str</code> attribute of numpy
dtype objects, include <code>'f4'</code> (32-bit floating point),
<code>'f8'</code> (64-bit floating point), <code>'i4'</code> (32-bit
signed integer), <code>'i2'</code> (16-bit signed integer),
<code>'i4'</code> (8-bit singed integer), <code>'i1'</code> (8-bit signed
integer), or <code>'S1'</code> (single-character string). From
compatibility with Scientific.IO.NetCDF, the old Numeric single character
typecodes can also be used (<code>'f'</code> instead of
<code>'f4'</code>, <code>'d'</code> instead of <code>'f8'</code>,
<code>'h'</code> or <code>'s'</code> instead of <code>'i2'</code>,
<code>'b'</code> or <code>'B'</code> instead of <code>'i1'</code>,
<code>'c'</code> instead of <code>'S1'</code>, and <code>'i'</code> or
<code>'l'</code> instead of <code>'i4'</code>).</p>
<p><b>Keywords:</b></p>
<p><b><code>dimensions</code></b> - a tuple containing the variable's
dimension names (defined previously with <code>createDimension</code>).
Default is an empty tuple which means the variable is a scalar (and
therefore has no dimensions).</p>
<p><b><code>fill_value</code></b> - If specified, the default netCDF
<code>_FillValue</code> (the value that the variable gets filled with
before any data is written to it) is replaced with this value.</p>
<p><b>Returns:</b></p>
<p>a <a href="netCDF3.Variable-class.html" class="link">Variable</a>
instance. All further operations on the netCDF Variable are accomplised
via <a href="netCDF3.Variable-class.html" class="link">Variable</a>
instance methods.</p>
<p>A list of attribute names corresponding to netCDF attributes defined
for the variable can be obtained with the <code>ncattrs()</code> method.
These attributes can be created by assigning to an attribute of the <a
href="netCDF3.Variable-class.html" class="link">Variable</a> instance. A
dictionary containing all the netCDF attribute name/value pairs is
provided by the <code>__dict__</code> attribute of a <a
href="netCDF3.Variable-class.html" class="link">Variable</a>
instance.</p>
<p>The instance variables <code>dimensions, dtype, ndim, shape</code> are
read-only (and should not be modified by the user).</p>
<!-- ==================== INSTANCE METHODS ==================== -->
<a name="section-InstanceMethods"></a>
<table class="summary" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="table-header">
<td align="left" colspan="2" class="table-header">
<span class="table-header">Instance Methods</span></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 href="netCDF3.Variable-class.html#__delattr__" class="summary-sig-name">__delattr__</a>(<span class="summary-sig-arg">...</span>)</span><br />
x.__delattr__('name') <==> del x.name</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="__delitem__"></a><span class="summary-sig-name">__delitem__</span>(<span class="summary-sig-arg">x</span>,
<span class="summary-sig-arg">y</span>)</span><br />
del 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="__getattr__"></a><span class="summary-sig-name">__getattr__</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 href="netCDF3.Variable-class.html#__getattribute__" class="summary-sig-name">__getattribute__</a>(<span class="summary-sig-arg">...</span>)</span><br />
x.__getattribute__('name') <==> x.name</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="__getitem__"></a><span class="summary-sig-name">__getitem__</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 href="netCDF3.Variable-class.html#__init__" class="summary-sig-name">__init__</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">dset</span>,
<span class="summary-sig-arg">name</span>,
<span class="summary-sig-arg">datatype</span>,
<span class="summary-sig-arg">dimensions</span>=<span class="summary-sig-default">()</span>,
<span class="summary-sig-arg">fill_value</span>=<span class="summary-sig-default">None</span>)</span><br />
x.__init__(...) initializes x; see x.__class__.__doc__ for signature</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="__len__"></a><span class="summary-sig-name">__len__</span>(<span class="summary-sig-arg">x</span>)</span><br />
len(x)</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="netCDF3.Variable-class.html#__new__" class="summary-sig-name">__new__</a>(<span class="summary-sig-arg">T</span>,
<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 href="netCDF3.Variable-class.html#__setattr__" class="summary-sig-name">__setattr__</a>(<span class="summary-sig-arg">...</span>)</span><br />
x.__setattr__('name', value) <==> x.name = value</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="__setitem__"></a><span class="summary-sig-name">__setitem__</span>(<span class="summary-sig-arg">x</span>,
<span class="summary-sig-arg">i</span>,
<span class="summary-sig-arg">y</span>)</span><br />
x[i]=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 href="netCDF3.Variable-class.html#assignValue" class="summary-sig-name">assignValue</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">val</span>)</span><br />
assign a value to a scalar variable.</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 href="netCDF3.Variable-class.html#delncattr" class="summary-sig-name">delncattr</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">name</span>,
<span class="summary-sig-arg">value</span>)</span><br />
delete a netCDF variable attribute.</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 href="netCDF3.Variable-class.html#getValue" class="summary-sig-name">getValue</a>(<span class="summary-sig-arg">self</span>)</span><br />
get the value of a scalar variable.</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 href="netCDF3.Variable-class.html#getncattr" class="summary-sig-name">getncattr</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">name</span>)</span><br />
retrievel a netCDF variable attribute.</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="ncattrs"></a><span class="summary-sig-name">ncattrs</span>(<span class="summary-sig-arg">self</span>)</span><br />
return netCDF attribute names for this <a
href="netCDF3.Variable-class.html" class="link">Variable</a> in a
list.</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 href="netCDF3.Variable-class.html#set_auto_maskandscale" class="summary-sig-name">set_auto_maskandscale</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">maskandscale</span>)</span><br />
turn on or off automatic conversion of variable data to and from
masked arrays and automatic packing/unpacking of variable data using
<code>scale_factor</code> and <code>add_offset</code> attributes.</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 href="netCDF3.Variable-class.html#setncattr" class="summary-sig-name">setncattr</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">name</span>,
<span class="summary-sig-arg">value</span>)</span><br />
set a netCDF variable attribute using name,value pair.</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>__format__</code>,
<code>__hash__</code>,
<code>__reduce__</code>,
<code>__reduce_ex__</code>,
<code>__repr__</code>,
<code>__sizeof__</code>,
<code>__str__</code>,
<code>__subclasshook__</code>
</p>
</td>
</tr>
</table>
<!-- ==================== INSTANCE VARIABLES ==================== -->
<a name="section-InstanceVariables"></a>
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<span class="table-header">Instance Variables</span></td>
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<span class="summary-type"> </span>
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<a name="dimensions"></a><span class="summary-name">dimensions</span><br />
A tuple containing the names of the dimensions associated with this
variable.
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<span class="summary-type"> </span>
</td><td class="summary">
<a name="dtype"></a><span class="summary-name">dtype</span><br />
A numpy dtype object describing the variable's data type.
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<span class="summary-type"> </span>
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<a name="ndim"></a><span class="summary-name">ndim</span><br />
The number of variable dimensions.
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<span class="summary-type"> </span>
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<a name="shape"></a><span class="summary-name">shape</span><br />
a tuple describing the current size of all the variable's dimensions.
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<!-- ==================== PROPERTIES ==================== -->
<a name="section-Properties"></a>
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<span class="table-header">Properties</span></td>
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<span class="summary-type"> </span>
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<a name="maskandscale"></a><span class="summary-name">maskandscale</span>
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<span class="summary-type"> </span>
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<a name="size"></a><span class="summary-name">size</span><br />
Return the number of stored elements.
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<p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
<code>__class__</code>
</p>
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<!-- ==================== METHOD DETAILS ==================== -->
<a name="section-MethodDetails"></a>
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<span class="table-header">Method Details</span></td>
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<a name="__delattr__"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__delattr__</span>(<span class="sig-arg">...</span>)</span>
</h3>
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>
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<p>x.__delattr__('name') <==> del x.name</p>
<dl class="fields">
<dt>Overrides:
object.__delattr__
</dt>
</dl>
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</div>
<a name="__getattribute__"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__getattribute__</span>(<span class="sig-arg">...</span>)</span>
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>
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<p>x.__getattribute__('name') <==> x.name</p>
<dl class="fields">
<dt>Overrides:
object.__getattribute__
</dt>
</dl>
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</div>
<a name="__init__"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__init__</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">dset</span>,
<span class="sig-arg">name</span>,
<span class="sig-arg">datatype</span>,
<span class="sig-arg">dimensions</span>=<span class="sig-default">()</span>,
<span class="sig-arg">fill_value</span>=<span class="sig-default">None</span>)</span>
<br /><em class="fname">(Constructor)</em>
</h3>
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>
</td>
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<p>x.__init__(...) initializes x; see x.__class__.__doc__ for
signature</p>
<dl class="fields">
<dt>Overrides:
object.__init__
</dt>
</dl>
</td></tr></table>
</div>
<a name="__new__"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__new__</span>(<span class="sig-arg">T</span>,
<span class="sig-arg">S</span>,
<span class="sig-arg">...</span>)</span>
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>
</td>
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<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>
<a name="__setattr__"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__setattr__</span>(<span class="sig-arg">...</span>)</span>
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>
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<p>x.__setattr__('name', value) <==> x.name = value</p>
<dl class="fields">
<dt>Overrides:
object.__setattr__
</dt>
</dl>
</td></tr></table>
</div>
<a name="assignValue"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">assignValue</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">val</span>)</span>
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>
</td>
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<p>assign a value to a scalar variable. Provided for compatibility with
Scientific.IO.NetCDF, can also be done by assigning to a slice ([:]).</p>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="delncattr"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">delncattr</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">name</span>,
<span class="sig-arg">value</span>)</span>
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>
</td>
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<p>delete a netCDF variable attribute. Only use if you need to delete a
netCDF attribute with the same name as one of the reserved python
attributes.</p>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="getValue"></a>
<div>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">getValue</span>(<span class="sig-arg">self</span>)</span>
</h3>
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>
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<p>get the value of a scalar variable. Provided for compatibility with
Scientific.IO.NetCDF, can also be done by slicing ([:]).</p>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="getncattr"></a>
<div>
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cellspacing="0" width="100%" bgcolor="white">
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<h3 class="epydoc"><span class="sig"><span class="sig-name">getncattr</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">name</span>)</span>
</h3>
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>
</td>
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<p>retrievel a netCDF variable attribute. Only use if you need to set a
netCDF attribute with the same name as one of the reserved python
attributes.</p>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="set_auto_maskandscale"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">set_auto_maskandscale</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">maskandscale</span>)</span>
</h3>
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>
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<p>turn on or off automatic conversion of variable data to and from
masked arrays and automatic packing/unpacking of variable data using
<code>scale_factor</code> and <code>add_offset</code> attributes.</p>
<p>If <code>maskandscale</code> is set to <code>True</code>, when data is
read from a variable it is converted to a masked array if any of the
values are exactly equal to the either the netCDF _FillValue or the value
specified by the missing_value variable attribute. The fill_value of the
masked array is set to the missing_value attribute (if it exists),
otherwise the netCDF _FillValue attribute (which has a default value for
each data type). When data is written to a variable, the masked array is
converted back to a regular numpy array by replacing all the masked
values by the fill_value of the masked array.</p>
<p>If <code>maskandscale</code> is set to <code>True</code>, and the
variable has a <code>scale_factor</code> and an <code>add_offset</code>
attribute, then data read from that variable is unpacked using:</p>
<pre class="literalblock">
data = self.scale_factor*data + self.add_offset
</pre>
<p>When data is written to a variable it is packed using:</p>
<pre class="literalblock">
data = (data - self.add_offset)/self.scale_factor
</pre>
<p>For more information on how <code>scale_factor</code> and
<code>add_offset</code> can be used to provide simple compression, see <a
href="http://www.cdc.noaa.gov/cdc/conventions/cdc_netcdf_standard.shtml"
target="_top">http://www.cdc.noaa.gov/cdc/conventions/cdc_netcdf_standard.shtml</a>.</p>
<p>The default value of <code>maskandscale</code> is <code>True</code>
(automatic conversions are performed).</p>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="setncattr"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">setncattr</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">name</span>,
<span class="sig-arg">value</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
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<p>set a netCDF variable attribute using name,value pair. Only use if
you need to set a netCDF attribute with the same name as one of the
reserved python attributes.</p>
<dl class="fields">
</dl>
</td></tr></table>
</div>
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