大约有 46,000 项符合查询结果（耗时：0.0519秒） [XML]
Determine the data types of a data frame's columns
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220
Your best bet to start is to use ?str(). To explore some examples, let's make some data:
set...
How to select rows with one or more nulls from a pandas DataFrame without listing columns explicitly
I have a dataframe with ~300K rows and ~40 columns.
I want to find out if any rows contain null values - and put these 'null'-rows into a separate dataframe so that I could explore them easily.
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initialize a numpy array
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answered Dec 26 '10 at 20:56
KatrielKatriel
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How to scale down a range of numbers with a known min and max value
...l. I want the height and width of each ellipse to be in a range of say 1-30. I have methods that find the minimum and maximum values from my data set, but I won't have the min and max until runtime. Is there an easy way to do this?
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Drop rows with all zeros in pandas data frame
...ere an equivalent function for dropping rows with all columns having value 0?
12 Answers
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tinyxml XML解析库下载（tinyxml2.h 和 tinyxml2.cpp） - 源码下载 - 清泛...
...ERT( x ) {}
#endif
#if defined(_MSC_VER) && (_MSC_VER >= 1400 )
// Microsoft visual studio, version 2005 and higher.
/*int _snprintf_s(
char *buffer,
size_t sizeOfBuffer,
size_t count,
const char *format [,
argument] ...
);*/
inline int TIXML_SNPRINTF( char* b...
Vagrant reverse port forwarding?
...ROR -o IdentitiesOnly=yes -i ~/.vagrant.d/insecure_private_key vagrant@127.0.0.1
SSH supports forwarding ports in the direction you want with the -R guestport:host:hostport option. So, if you wanted to connect to port 12345 on the guest and have it forwarded to localhost:80, you would use this comm...
Simple regular expression for a decimal with a precision of 2
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408
Valid regex tokens vary by implementation. A generic form is:
[0-9]+(\.[0-9][0-9]?)?
More co...
Fastest way to replace NAs in a large data.table
... a large data.table , with many missing values scattered throughout its ~200k rows and 200 columns. I would like to re code those NA values to zeros as efficiently as possible.
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Fastest way to check if a string matches a regexp in ruby?
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104
Starting with Ruby 2.4.0, you may use RegExp#match?:
pattern.match?(string)
Regexp#match? is...