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How to remove convem>x m>ity defects in a Sudoku square?
...he first step is to adjust the brightness in the image, by dividing each pim>x m>el with the result of a closing operation:
src = ColorConvert[Import["http://davemark.com/images/sudoku.jpg"], "Grayscale"];
white = Closing[src, DiskMatrim>x m>[5]];
srcAdjusted = Image[ImageData[src]/ImageData[white]]
The ...
What is a typedef enum in Objective-C?
...C++), any references to this must be preceded with the enum keyword. For em>x m>ample:
enum tagname m>x m>; // declare m>x m> of type 'enum tagname'
tagname m>x m>; // ERROR in C/Objective-C, OK in C++
In order to avoid having to use the enum keyword everywhere, a typedef can be created:
enum tagname { ... };
ty...
What's the best way to make a d3.js visualisation layout responsive?
...t doesn't require redrawing the graph, and it involves modifying the viewBom>x m> and preserveAspectRatio attributes on the <svg> element:
<svg id="chart" width="960" height="500"
viewBom>x m>="0 0 960 500"
preserveAspectRatio="m>x m>MidYMid meet">
</svg>
Update 11/24/15: most modern brow...
How do I adjust the anchor point of a CALayer, when Auto Layout is being used?
...has a transform (other than the default identity transform) - but that is em>x m>actly what autolayout does. The way autolayout works is that in layoutSubviews the runtime comes dashing through all the constraints and setting the frames of all the views accordingly.
In other words, the constraints are n...
Pandas: create two new columns in a dataframe with values calculated from a pre-em>x m>isting column
...
I'd just use zip:
In [1]: from pandas import *
In [2]: def calculate(m>x m>):
...: return m>x m>*2, m>x m>*3
...:
In [3]: df = DataFrame({'a': [1,2,3], 'b': [2,3,4]})
In [4]: df
Out[4]:
a b
0 1 2
1 2 3
2 3 4
In [5]: df["A1"], df["A2"] = zip(*df["a"].map(calculate))
In [6]: df
Out[6]...
How can I obtain the element-wise logical NOT of a pandas Series?
...n error, instead you'll get a garbage mask of ints that won't work as you em>x m>pect.
In[1]: df = pd.DataFrame({'A':[True, False, np.nan], 'B':[True, False, True]})
In[2]: df.dropna(inplace=True)
In[3]: df['A']
Out[3]:
0 True
1 False
Name: A, dtype object
In[4]: ~df['A']
Out[4]:
0 -2
0 -1
Name...
Writing Unicode tem>x m>t to a tem>x m>t file?
...
Deal em>x m>clusively with unicode objects as much as possible by decoding things to unicode objects when you first get them and encoding them as necessary on the way out.
If your string is actually a unicode object, you'll need to con...
If vs. Switch Speed
...
The compiler can build jump tables where applicable. For em>x m>ample, when you use the reflector to look at the code produced, you will see that for huge switches on strings, the compiler will actually generate code that uses a hash table to dispatch these. The hash table uses the strin...
Use curly braces to initialize a Set in Python
...
There are two obvious issues with the set literal syntam>x m>:
my_set = {'foo', 'bar', 'baz'}
It's not available before Python 2.7
There's no way to em>x m>press an empty set using that syntam>x m> (using {} creates an empty dict)
Those may or may not be important to you.
The section of ...
JSON.parse vs. eval()
...n.parse just parses JSON whereas eval would leave the door open to all JS em>x m>pressions.
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