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Implementing slicing in __getitem__
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answered May 29 '10 at 22:56
Ignacio Vazquez-AbramsIgnacio Vazquez-Abrams
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Apply a function to every row of a matrix or a data frame
... 3 4
[3,] 5 6
R> apply(M, 1, function(x) 2*x[1]+x[2])
[1] 4 10 16
R>
This takes a matrix and applies a (silly) function to each row. You pass extra arguments to the function as fourth, fifth, ... arguments to apply().
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How do I represent a time only value in .NET?
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answered Jan 10 '10 at 15:00
Jon SkeetJon Skeet
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twig: IF with multiple conditions
...owLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\...
What happens if you static_cast invalid value to enum class?
...ering with a quote from the C++11 and C++14 Standards:
[expr.static.cast]/10
A value of integral or enumeration type can be explicitly converted to an enumeration type. The value is unchanged if the original value is within the range of the enumeration values (7.2). Otherwise, the resulting val...
Why does `a == b or c or d` always evaluate to True?
...gt; ast.parse("if a == b or c or d or e: ...")
<_ast.Module object at 0x1031ae6a0>
>>> ast.dump(_)
"Module(body=[If(test=BoolOp(op=Or(), values=[Compare(left=Name(id='a', ctx=Load()), ops=[Eq()], comparators=[Name(id='b', ctx=Load())]), Name(id='c', ctx=Load()), Name(id='d', ctx=Load(...
Can you have if-then-else logic in SQL? [duplicate]
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106
You can make the following sql query
IF ((SELECT COUNT(*) FROM table1 WHERE project = 1) >...
Calculate relative time in C#
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1005
Jeff, your code is nice but could be clearer with constants (as suggested in Code Complete).
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Python: Ignore 'Incorrect padding' error when base64 decoding
...rs♦
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answered Mar 21 '12 at 14:57
Simon SapinSimon Sapin
8,326...
Best way to handle list.index(might-not-exist) in python?
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edited Jan 25 '10 at 14:32
answered Jan 25 '10 at 14:02
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