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Ruby - elegantly convert variable to an array if not an array already
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[*foo] or Array(foo) will work most of the time, but for some cases like a hash, it messes it up...
How to remove a key from Hash and get the remaining hash in Ruby/Rails?
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answered Jun 19 '12 at 17:03
Peter BrownPeter Brown
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Grouping functions (tapply, by, aggregate) and the *apply family
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R has ...
Validating IPv4 addresses with regexp
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Remove duplicate elements from array in Ruby
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the Tin Man
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answered Dec 3 '11 at 5:24
Mithun Sasidharan...
Image Segmentation using Mean Shift explained
...hood and whose value is within a distance d.
The Mean Shift takes usually 3 inputs:
A distance function for measuring distances between pixels. Usually the Euclidean distance, but any other well defined distance function could be used. The Manhattan
Distance is another useful choice sometimes.
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Logical operators for boolean indexing in Pandas
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Slicing of a NumPy 2d array, or how do I extract an mxm submatrix from an nxn array (n>m)?
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As Sven mentioned, x[[[0],[2]],[1,3]] will give back the 0 and 2 rows that match with the 1 and 3 columns while x[[0,2],[1,3]] will return the values x[0,1] and x[2,3] in an array.
There is a helpful function for doing the first example I gave, numpy.ix_. Y...
What is Weak Head Normal Form?
...re not in normal form:
1 + 2 -- we could evaluate this to 3
(\x -> x + 1) 2 -- we could apply the function
"he" ++ "llo" -- we could apply the (++)
(1 + 1, 2 + 2) -- we could evaluate 1 + 1 and 2 + 2
Weak head normal form
An expression in weak head normal ...