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hash function for string
...o terrible is because it does NOT take into consideration string character order, so hash("ab") would therefore return the same value as hash("ba"). This is not so with the 2nd edition hash, however, which would (much better!) return two different values for those strings.
The GCC C++11 hashing fun...
Selecting multiple columns in a pandas dataframe
...mns, like df.ix[0, 'Col1':'Col5']. That gets all columns that happen to be ordered between Col1 and Col5 in the df.columns array. It is incorrect to say that ix indexes rows. That is just its most basic use. It also supports much more indexing than that. So, ix is perfectly general for this question...
OrderBy descending in Lambda expression?
I know in normal Linq grammar, orderby xxx descending is very easy, but how do I do this in Lambda expression?
6 Answers
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How does the bitwise complement operator (~ tilde) work?
... positive numbers. Think of -3 as the number to which 3 should be added in order to get zero and you'll see that this number is 1101, remember that binary addition is just like elementary school (decimal) addition only you carry one when you get to two rather than 10.
1101 +
0011 // 3
=
10000...
Inline instantiation of a constant List
... then IEnumerable<string> would probably be most appropriate. If the order matters and you want people to be able to access it by index, IList<T> may be appropriate. If you want to make the immutability apparent, declaring it as ReadOnlyCollection<T> could be handy - but inflexible...
Android SDK manager won't open
...t; Environment variables -> PATH -> edit: make sure they are in this order: C:\Program Files\Java\jdk1.7.0_11\bin;%SystemRoot%\system32;....
– Hải Phong
Jan 21 '13 at 2:23
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Disable assertions in Python
...tly slow down execution. For some algorithms, checks of this sort can take orders of magnitude longer than the entire program. Think of running a naive but simpler implementation (so less likely to contain errors) of the same algorithm to check correctness. Or a check by exhaustive enumeration of so...
How can I put a database under git (version control)?
...eeping schema creation scripts as a set of sequential scripts to be ran in order. While this is a good best practice I don't see how it would works without a central repository, which is un-GIT.
– Frank Schwieterman
Mar 17 '10 at 2:49
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How to get the browser viewport dimensions?
... others) you must have the <!DOCTYPE html> at the top of the page in order for the code to work.
– Tzury Bar Yochay
May 9 '13 at 7:44
6
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What is a “batch”, and why is GO used?
...o.
Some SQL statements MUST be separated by GO from the following ones in order to work.
For example, you can't drop a table and re-create the same-named table in a single transaction, at least in Sybase (ditto for creating procedures/triggers):
> drop table tempdb.guest.x1
> cre...