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How to remove convexity defects in a Sudoku square?
... pixel with the result of a closing operation:
src = ColorConvert[Import["http://davemark.com/images/sudoku.jpg"], "Grayscale"];
white = Closing[src, DiskMatrix[5]];
srcAdjusted = Image[ImageData[src]/ImageData[white]]
The next step is to find the sudoku area, so I can ignore (mask out) the bac...
explicit casting from super class to subclass
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how to exclude null values in array_agg like in string_agg using postgres?
... x
) un
WHERE
u IS NOT NULL;
The second:
/*
With reference to
http://ejrh.wordpress.com/2011/09/27/denormalisation-aggregate-function-for-postgresql/
*/
CREATE OR REPLACE FUNCTION fn_array_agg_notnull (
a anyarray
, b anyelement
) RETURNS ANYARRAY
AS $$
BEGIN
IF b IS NOT NU...
efficient circular buffer?
...hape (n,) or (n,1)?
In this benchmark, deque is 448ms. Numpy.roll is 29ms
http://scimusing.wordpress.com/2013/10/25/ring-buffers-in-pythonnumpy/
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Difference between `set`, `setq`, and `setf` in Common Lisp?
...the other hand, is subtle indeed -- it's like an "indirection". I suggest http://www.n-a-n-o.com/lisp/cmucl-tutorials/LISP-tutorial-16.html as a better way to get started understanding it than any answer here can give... in short, though, setf takes the first argument as a "reference", so that e.g....
Generate a random point within a circle (uniformly)
...) * sin(angle)
This will give you uniform point distribution on a disk.
http://mathworld.wolfram.com/DiskPointPicking.html
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How to force vim to syntax-highlight a file as html?
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JavaScript: location.href to open in new window/tab?
...
window.open(
'https://support.wwf.org.uk/earth_hour/index.php?type=individual',
'_blank' // <- This is what makes it open in a new window.
);
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git rebase, keeping track of 'local' and 'remote'
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Why can't I initialize non-const static member or static array in class?
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