Changeset 3714

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Timestamp:
04/13/07 15:44:24 (1 year ago)
Author:
wfspotz@sandia.gov
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Updated date, example function documentation and python links

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  • trunk/numpy/doc/swig/numpy_swig.html

    r3713 r3714  
    66<title>numpy.i: a SWIG Interface File for NumPy</title> 
    77<meta name="author" content="Bill Spotz" /> 
    8 <meta name="date" content="4 April, 2007" /> 
     8<meta name="date" content="13 April, 2007" /> 
    99<style type="text/css"> 
    1010 
     
    303303</tr> 
    304304<tr><th class="docinfo-name">Date:</th> 
    305 <td>4 April, 2007</td></tr> 
     305<td>13 April, 2007</td></tr> 
    306306</tbody> 
    307307</table> 
     
    364364def rms(seq): 
    365365    &quot;&quot;&quot; 
     366    rms: return the root mean square of a sequence 
    366367    rms(numpy.ndarray) -&gt; double 
    367368    rms(list) -&gt; double 
     
    454455of code: 12--20, 25 and 30.  Line 10 parses the input to the <tt class="docutils literal"><span class="pre">rms</span></tt> 
    455456function.  From the format string <tt class="docutils literal"><span class="pre">&quot;O:rms&quot;</span></tt>, we can see that the 
    456 argument list is expected to be a single python object (specified by 
    457 the <tt class="docutils literal"><span class="pre">O</span></tt> before the colon) and whose pointer is stored in <tt class="docutils literal"><span class="pre">obj0</span></tt>. 
    458 A number of functions, supplied by <tt class="docutils literal"><span class="pre">numpy.i</span></tt>, are called to make an
    459 check the (possible) conversion from a generic python object to a 
    460 <a class="reference" href="http://numpy.scipy.org">NumPy</a> array.  These functions are explained in the section <a class="reference" href="#helper-functions">Helper 
    461 Functions</a>, but hopefully their names are self-explanatory.  At lin
    462 12 we use <tt class="docutils literal"><span class="pre">obj0</span></tt> to construct a <a class="reference" href="http://numpy.scipy.org">NumPy</a> array.  At line 17, we 
    463 check the validity of the result: that it is non-null and that it ha
    464 a single dimension of arbitrary length.  Once these states ar
    465 verified, we extract the data buffer and length in lines 19 and 20 so 
    466 that we can call the underlying C function at line 22.  Line 25 
    467 performs memory management for the case where we have created a new 
    468 array that is no longer needed.</p> 
     457argument list is expected to be a single <a class="reference" href="http://www.python.org">python</a> object (specified 
     458by the <tt class="docutils literal"><span class="pre">O</span></tt> before the colon) and whose pointer is stored in 
     459<tt class="docutils literal"><span class="pre">obj0</span></tt>.  A number of functions, supplied by <tt class="docutils literal"><span class="pre">numpy.i</span></tt>, are calle
     460to make and check the (possible) conversion from a generic <a class="reference" href="http://www.python.org">python</a> 
     461object to a <a class="reference" href="http://numpy.scipy.org">NumPy</a> array.  These functions are explained in the 
     462section <a class="reference" href="#helper-functions">Helper Functions</a>, but hopefully their names ar
     463self-explanatory.  At line 12 we use <tt class="docutils literal"><span class="pre">obj0</span></tt> to construct a <a class="reference" href="http://numpy.scipy.org">NumPy</a> 
     464array.  At line 17, we check the validity of the result: that it i
     465non-null and that it has a single dimension of arbitrary length.  Onc
     466these states are verified, we extract the data buffer and length in 
     467lines 19 and 20 so that we can call the underlying C function at line 
     46822.  Line 25 performs memory management for the case where we have 
     469created a new array that is no longer needed.</p> 
    469470<p>This code has a significant amount of error handling.  Note the 
    470471<tt class="docutils literal"><span class="pre">SWIG_fail</span></tt> is a macro for <tt class="docutils literal"><span class="pre">goto</span> <span class="pre">fail</span></tt>, refering to the label at 
     
    624625<p>These are typically used in situations where in C/C++, you would 
    625626allocate a(n) array(s) on the heap, and call the function to fill the 
    626 array(s) values.  In python, the arrays are allocated for you and 
     627array(s) values.  In <a class="reference" href="http://www.python.org">python</a>, the arrays are allocated for you and 
    627628returned as new array objects.</p> 
    628629<p>Note that we support <tt class="docutils literal"><span class="pre">DATA_TYPE*</span></tt> argout typemaps in 1D, but not 2D 
    629630or 3D.  This because of a quirk with the <a class="reference" href="http://www.swig.org">SWIG</a> typemap syntax and 
    630631cannot be avoided.  Note that for these types of 1D typemaps, the 
    631 python function will take a single argument representing <tt class="docutils literal"><span class="pre">DIM1</span></tt>.</p> 
     632<a class="reference" href="http://www.python.org">python</a> function will take a single argument representing <tt class="docutils literal"><span class="pre">DIM1</span></tt>.</p> 
    632633</div> 
    633634<div class="section"> 
     
    697698seemed unlikely that there would be any independent (non-<a class="reference" href="http://www.python.org">python</a>, 
    698699non-<a class="reference" href="http://numpy.scipy.org">NumPy</a>) application code that people would be using <a class="reference" href="http://www.swig.org">SWIG</a> to 
    699 generate a python interface to, that also used these definitions for 
    700 complex types.  More likely, these application codes will define their 
    701 own complex types, or in the case of C++, use <tt class="docutils literal"><span class="pre">std::complex</span></tt>. 
     700generate a <a class="reference" href="http://www.python.org">python</a> interface to, that also used these definitions 
     701for complex types.  More likely, these application codes will define 
     702their own complex types, or in the case of C++, use <tt class="docutils literal"><span class="pre">std::complex</span></tt>. 
    702703Assuming these data structures are compatible with <a class="reference" href="http://www.python.org">python</a> and 
    703704<a class="reference" href="http://numpy.scipy.org">NumPy</a> complex types, <tt class="docutils literal"><span class="pre">%numpy_typemap</span></tt> expansions as above (with 
     
    751752<p>Arguments:</p> 
    752753<ul class="simple"> 
    753 <li><tt class="docutils literal"><span class="pre">PyObject*</span> <span class="pre">py_obj</span></tt>, a general python object.</li> 
     754<li><tt class="docutils literal"><span class="pre">PyObject*</span> <span class="pre">py_obj</span></tt>, a general <a class="reference" href="http://www.python.org">python</a> object.</li> 
    754755</ul> 
    755756<p>Return a string describing the type of <tt class="docutils literal"><span class="pre">py_obj</span></tt>.</p> 
     
    783784<p>Arguments:</p> 
    784785<ul class="simple"> 
    785 <li><tt class="docutils literal"><span class="pre">PyObject*</span> <span class="pre">input</span></tt>, a general python object.</li> 
     786<li><tt class="docutils literal"><span class="pre">PyObject*</span> <span class="pre">input</span></tt>, a general <a class="reference" href="http://www.python.org">python</a> object.</li> 
    786787<li><tt class="docutils literal"><span class="pre">int</span> <span class="pre">typecode</span></tt>, the desired <a class="reference" href="http://numpy.scipy.org">NumPy</a> typecode.</li> 
    787788</ul> 
    788789<p>Cast <tt class="docutils literal"><span class="pre">input</span></tt> to a <tt class="docutils literal"><span class="pre">PyArrayObject*</span></tt> if legal, and ensure that 
    789790it is of type <tt class="docutils literal"><span class="pre">typecode</span></tt>.  If <tt class="docutils literal"><span class="pre">input</span></tt> cannot be cast, or the 
    790 <tt class="docutils literal"><span class="pre">typecode</span></tt> is wrong, set a python error and return <tt class="docutils literal"><span class="pre">NULL</span></tt>.</p> 
     791<tt class="docutils literal"><span class="pre">typecode</span></tt> is wrong, set a <a class="reference" href="http://www.python.org">python</a> error and return <tt class="docutils literal"><span class="pre">NULL</span></tt>.</p> 
    791792</blockquote> 
    792793<p><strong>obj_to_array_allow_conversion()</strong></p> 
     
    795796<p>Arguments:</p> 
    796797<ul class="simple"> 
    797 <li><tt class="docutils literal"><span class="pre">PyObject*</span> <span class="pre">input</span></tt>, a general python object.</li> 
     798<li><tt class="docutils literal"><span class="pre">PyObject*</span> <span class="pre">input</span></tt>, a general <a class="reference" href="http://www.python.org">python</a> object.</li> 
    798799<li><tt class="docutils literal"><span class="pre">int</span> <span class="pre">typecode</span></tt>, the desired <a class="reference" href="http://numpy.scipy.org">NumPy</a> typecode of the resulting 
    799800array.</li> 
     
    803804<p>Convert <tt class="docutils literal"><span class="pre">input</span></tt> to a <a class="reference" href="http://numpy.scipy.org">NumPy</a> array with the given <tt class="docutils literal"><span class="pre">typecode</span></tt>. 
    804805On success, return a valid <tt class="docutils literal"><span class="pre">PyArrayObject*</span></tt> with the correct 
    805 type.  On failure, the python error string will be set and the 
     806type.  On failure, the <a class="reference" href="http://www.python.org">python</a> error string will be set and the 
    806807routine returns <tt class="docutils literal"><span class="pre">NULL</span></tt>.</p> 
    807808</blockquote> 
     
    827828<p>Arguments:</p> 
    828829<ul class="simple"> 
    829 <li><tt class="docutils literal"><span class="pre">PyObject*</span> <span class="pre">input</span></tt>, a general python object.</li> 
     830<li><tt class="docutils literal"><span class="pre">PyObject*</span> <span class="pre">input</span></tt>, a general <a class="reference" href="http://www.python.org">python</a> object.</li> 
    830831<li><tt class="docutils literal"><span class="pre">int</span> <span class="pre">typecode</span></tt>, the desired <a class="reference" href="http://numpy.scipy.org">NumPy</a> typecode of the resulting 
    831832array.</li> 
     
    846847</ul> 
    847848<p>Test whether <tt class="docutils literal"><span class="pre">ary</span></tt> is contiguous.  If so, return 1.  Otherwise, 
    848 set a python error and return 0.</p> 
     849set a <a class="reference" href="http://www.python.org">python</a> error and return 0.</p> 
    849850</blockquote> 
    850851<p><strong>require_native()</strong></p> 
     
    856857</ul> 
    857858<p>Require that <tt class="docutils literal"><span class="pre">ary</span></tt> is not byte-swapped.  If the array is not 
    858 byte-swapped, return 1.  Otherwise, set a python error and return 
    859 0.</p> 
     859byte-swapped, return 1.  Otherwise, set a <a class="reference" href="http://www.python.org">python</a> error and 
     860return 0.</p> 
    860861</blockquote> 
    861862<p><strong>require_dimensions()</strong></p> 
     
    869870<p>Require <tt class="docutils literal"><span class="pre">ary</span></tt> to have a specified number of dimensions.  If the 
    870871array has the specified number of dimensions, return 1. 
    871 Otherwise, set a python error and return 0.</p> 
     872Otherwise, set a <a class="reference" href="http://www.python.org">python</a> error and return 0.</p> 
    872873</blockquote> 
    873874<p><strong>require_dimensions_n()</strong></p> 
     
    883884<p>Require <tt class="docutils literal"><span class="pre">ary</span></tt> to have one of a list of specified number of 
    884885dimensions.  If the array has one of the specified number of 
    885 dimensions, return 1.  Otherwise, set the python error string and 
    886 return 0.</p> 
     886dimensions, return 1.  Otherwise, set the <a class="reference" href="http://www.python.org">python</a> error string 
     887and return 0.</p> 
    887888</blockquote> 
    888889<p><strong>require_size()</strong></p> 
     
    897898</ul> 
    898899<p>Require <tt class="docutils literal"><span class="pre">ary</span></tt> to have a specified shape.  If the array has the 
    899 specified shape, return 1.  Otherwise, set the python error string 
    900 and return 0.</p> 
     900specified shape, return 1.  Otherwise, set the <a class="reference" href="http://www.python.org">python</a> error 
     901string and return 0.</p> 
    901902</blockquote> 
    902903</blockquote> 
     
    913914double dot(int len, double* vec1, double* vec2); 
    914915</pre> 
    915 <p>The python interface that we want is:</p> 
     916<p>The <a class="reference" href="http://www.python.org">python</a> interface that we want is:</p> 
    916917<pre class="literal-block"> 
    917918def dot(vec1, vec2): 
     
    923924arguments, and our typemaps are set up for dimensions that apply to a 
    924925single array (in fact, <a class="reference" href="http://www.swig.org">SWIG</a> does not provide a mechanism for 
    925 associating <tt class="docutils literal"><span class="pre">len</span></tt> with <tt class="docutils literal"><span class="pre">vec2</span></tt> that takes two python input 
     926associating <tt class="docutils literal"><span class="pre">len</span></tt> with <tt class="docutils literal"><span class="pre">vec2</span></tt> that takes two <a class="reference" href="http://www.python.org">python</a> input 
    926927arguments).  The recommended solution is the following:</p> 
    927928<pre class="literal-block"> 
     
    10531054<div class="footer"> 
    10541055<hr class="footer" /> 
    1055 Generated on: 2007-04-13 20:37 UTC. 
     1056Generated on: 2007-04-13 20:43 UTC. 
    10561057Generated by <a class="reference" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source. 
    10571058 
  • trunk/numpy/doc/swig/numpy_swig.pdf

    r3713 r3714  
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