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Added a pad example

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This commit is contained in:
Nicolas P. Rougier
2016-07-14 17:47:38 -05:00
parent dda652cef7
commit e0103959dd
2 changed files with 15 additions and 3 deletions
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8
README.html
View File

@@ -116,12 +116,18 @@ python -c <span class="literal string double">&quot;import numpy; numpy.info(num
<span class="keyword">print</span><span class="punctuation">(</span><span class="name">m</span><span class="punctuation">)</span>
</pre>
</li>
<li><p class="first">Create a 2d array with 1 on the border and 0 inside (★☆☆)</p>
<li><p class="first">Create a 2d array with 1 on the border and 0 inside (★☆☆)</p>
<pre class="code python literal-block">
<span class="name">Z</span> <span class="operator">=</span> <span class="name">np</span><span class="operator">.</span><span class="name">ones</span><span class="punctuation">((</span><span class="literal number integer">10</span><span class="punctuation">,</span><span class="literal number integer">10</span><span class="punctuation">))</span>
<span class="name">Z</span><span class="punctuation">[</span><span class="literal number integer">1</span><span class="punctuation">:</span><span class="operator">-</span><span class="literal number integer">1</span><span class="punctuation">,</span><span class="literal number integer">1</span><span class="punctuation">:</span><span class="operator">-</span><span class="literal number integer">1</span><span class="punctuation">]</span> <span class="operator">=</span> <span class="literal number integer">0</span>
</pre>
</li>
<li><p class="first">How to add a border (filled with 0's) around an existing array ? (★☆☆)</p>
<pre class="code python literal-block">
<span class="name">Z</span> <span class="operator">=</span> <span class="name">np</span><span class="operator">.</span><span class="name">ones</span><span class="punctuation">((</span><span class="literal number integer">5</span><span class="punctuation">,</span><span class="literal number integer">5</span><span class="punctuation">))</span>
<span class="name">Z</span> <span class="operator">=</span> <span class="name">np</span><span class="operator">.</span><span class="name">pad</span><span class="punctuation">(</span><span class="name">Z</span><span class="punctuation">,</span> <span class="name">pad_width</span><span class="operator">=</span><span class="literal number integer">1</span><span class="punctuation">,</span> <span class="name">mode</span><span class="operator">=</span><span class="literal string single">'constant'</span><span class="punctuation">,</span> <span class="name">constant_values</span><span class="operator">=</span><span class="literal number integer">0</span><span class="punctuation">)</span>
</pre>
</li>
<li><p class="first">What is the result of the following expression? (★☆☆)</p>
<pre class="code python literal-block">
<span class="literal number integer">0</span> <span class="operator">*</span> <span class="name">np</span><span class="operator">.</span><span class="name">nan</span>

10
README.rst
View File

@@ -141,14 +141,20 @@ Thanks to Michiaki Ariga, there is now a
print(m)
#. Create a 2d array with 1 on the border and 0 inside (★☆☆)
#. Create a 2d array with 1 on the border and 0 inside (★☆☆)
.. code-block:: python
Z = np.ones((10,10))
Z[1:-1,1:-1] = 0
#. How to add a border (filled with 0's) around an existing array ? (★☆☆)
.. code-block:: python
Z = np.ones((5,5))
Z = np.pad(Z, pad_width=1, mode='constant', constant_values=0)
#. What is the result of the following expression? (★☆☆)
.. code-block:: python