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With arrays, why is it the case that a[5] == 5[a]?
... then a[0] is at 0x1230, a[1] is at 0x1234, a[2] at 0x1238...a[5] at x1244 etc. If we just add 5 to 0x1230, we get 0x1235, which is wrong.
– James Curran
Dec 19 '08 at 17:21
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Convert data.frame column format from character to factor
...df, is.character, as.factor)
# select character columns 'char1', 'char2', etc. to factor:
df <- mutate_at(df, vars(char1, char2), as.factor)
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Implicit type conversion rules in C++ operators
...at are the implicit type conversion rules in C++ when adding, multiplying, etc. For example,
9 Answers
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Overloading member access operators ->, .*
... with the exception of the member access operators -> , .* , ->* etc.
5 Answers
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What is the best way to compare floats for almost-equality in Python?
...t's worth noting that the documentation also says: "Modulo error checking, etc, the function will return the result of..." In other words, the isclose function (above) is not a complete implementation.
– rkersh
Jul 14 '16 at 19:50
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How does Django's Meta class work?
...her the model is abstract or not, singular and plural versions of the name etc.
Short explanation is here: Django docs: Models: Meta options
List of available meta options is here: Django docs: Model Meta options
For latest version of Django: Django docs: Model Meta options
Metaclass in Python:
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__FILE__, __LINE__, and __FUNCTION__ usage in C++
... It's possible with constexpr that uses a lookup table or bitwise XOR, etc. to obfuscate any string literals in your binary. There are various examples out there if you search. Of course obfuscation is just obfuscation and not security, but if you don't want to make your files and functions obvi...
Copy multiple files in Python
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If you don't want to copy the whole tree (with subdirs etc), use or glob.glob("path/to/dir/*.*") to get a list of all the filenames, loop over the list and use shutil.copy to copy each file.
for filename in glob.glob(os.path.join(source_dir, '*.*')):
shutil.copy(filename, de...
Purpose of ESI & EDI registers?
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In addition to the string operations (MOVS/INS/STOS/CMPS/SCASB/W/D/Q etc.) mentioned in the other answers, I wanted to add that there are also more "modern" x86 assembly instructions that implicitly use at least EDI/RDI:
The SSE2 MASKMOVDQU (and the upcoming AVX VMASKMOVDQU) instruction sele...
How to interpret API documentation function parameters?
...f syntax convention, from Python, man pages, javascript libs (Highcharts), etc.
Breaking down your example from Adobe API
fillPath
([fillColor]
[, mode]
[, opacity]
[, preserveTransparency] [, feather]
[, wholePath] [, antiAlias])
We see that fillPath() (a function) takes optional arguments fillCo...