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Write a program to find 100 largest numbers out of an array of 1 billion numbers
... of the i'th number to be inserted to the queue is the probability of a random variable being larger than at least i-K random variables from the same distribution (the first k numbers are automatically added to the queue). We can use order statistics (see link) to calculate this probability. For exa...
add a string prefix to each value in a string column using Pandas
...mn of a pandas dataframe (elegantly).
I already figured out how to kind-of do this and I am currently using:
5 Answers
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Define preprocessor macro through CMake?
How do I define a preprocessor variable through CMake?
3 Answers
3
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How to represent multiple conditions in a shell if statement?
...) ]
then echo abc
else echo efg
fi
I've enclosed the references to $g in double quotes; that's good practice, in general. Strictly, the parentheses aren't needed because the precedence of -a and -o makes it correct even without them.
Note that the -a and -o operators are part of the POSIX specif...
How to search for a part of a word with ElasticSearch
...in_gram and max_gram analyzer settings should be enough to narrow searches down to one record, and no more (a max_gram of 15 over a name is probably wasteful, since very few names share a substring that long).
– rthbound
Dec 18 '13 at 23:17
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Create an empty data.frame
...Here's an other example with different column types :
df <- data.frame(Doubles=double(),
Ints=integer(),
Factors=factor(),
Logicals=logical(),
Characters=character(),
stringsAsFactors=FALSE)
str(df)
> str(df...
Rounding up to next power of 2
... @MappaM This answer is still highly relevant and the best portable way to do it. Your 64-bit version has undefined behaviour if x > UINT32_MAX and isn't branchless. Also, GCC and Clang use -mtune=generic by default (as do most distros), so your code will NOT expand to the lzcnt instruction on ...
How to use multiple AWS Accounts from the command line?
...LE environment variable. When the default environment variable is set, you do not need to specify the profile on each command.
Linux, OS X Example:
$ export AWS_DEFAULT_PROFILE=account1
$ aws dynamodb list-tables
Windows Example:
$ set AWS_DEFAULT_PROFILE=account1
$ aws s3 ls
...
xUnit.net: Global setup + teardown?
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As far as I know, xUnit does not have a global initialization/teardown extension point. However, it is easy to create one. Just create a base test class that implements IDisposable and do your initialization in the constructor and your teardown in t...
如何选择机器学习算法 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术
...选择在交叉验证中表现最好的。jmp0xf 译自Edwin Chen
How do you know what machine learning algorithm to choose for your classification problem? Of course, if you really care about accuracy, your best bet is to test out a couple different ones (making sure to try different parameters ...