大约有 7,000 项符合查询结果（耗时：0.0226秒） [XML]
unsigned int vs. size_t
...ry model: Pointers are far (32-bit), but individual objects are limited to 64k (so size_t can be 16-bit).
– dan04
Nov 28 '10 at 3:46
8
...
Converting a column within pandas dataframe from int to string
...0 1
1 2 3
2 4 5
3 6 7
4 8 9
In [18]: df.dtypes
Out[18]:
A int64
B int64
dtype: object
Convert a series
In [19]: df['A'].apply(str)
Out[19]:
0 0
1 2
2 4
3 6
4 8
Name: A, dtype: object
In [20]: df['A'].apply(str)[0]
Out[20]: '0'
Don't forget to assign the resul...
Need a good hex editor for Linux [closed]
...is no good hex editor for Linux system, specially for big files.
It uses 64 bit file descriptors (supports files or devices up to 2^64 bytes , means some exabytes but tested only 1 PetaByte file (yet). ).
It does NOT copy whole file to your RAM. That make it FAST and can open files (which sizes ar...
How to set JAVA_HOME in Linux for all users
... /etc/profile.d/jdk_home.sh:
#!/bin/sh
export JAVA_HOME=/opt/ibm/java-x86_64-60/
export PATH=$JAVA_HOME/bin:$PATH
I initially neglected the first line (the #!/bin/sh), and it won't work without it.
Now it's working:
$ echo $JAVA_HOME
/opt/ibm/java-x86_64-60/
...
Why can't I use switch statement on a String?
...
84
An if-elseif-elseif-elseif-else might be faster, but I'd take the cleaner code 99 times times out of 100. Strings, being immutable, cache t...
Remove the bottom divider of an android ListView
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84
As @ScootrNova said, this seems to be behaving differently (a.k.a buggy) in android 4.4.x (I do...
What is time_t ultimately a typedef to?
...t systems implement the time_t type as a signed
integer (typically 32 or 64 bits wide)
which represents the number of seconds
since the start of the Unix epoch:
midnight UTC of January 1, 1970 (not
counting leap seconds). Some systems
correctly handle negative time values,
while others...
Quit and restart a clean R session from within R?
...eActiveBinding("restart.R", function() { shell.exec(paste0(R.home(),"/bin/x64/Rgui.exe")); q("no") }, .GlobalEnv)
You'll need to edit the file path /bin/x64/Rgui.exe to match whatever you use to start R. You just put this line in your .Rprofile file, then you can call it by entering restart.R in y...
What is the smallest possible valid PDF?
... 69 6C 65 72 3C
3C 2F 52 6F 6F 74 3C 3C 2F 50 61 67 65 73 3C 3C
2F 4B 69 64 73 5B 3C 3C 2F 4D 65 64 69 61 42 6F
78 5B 30 20 30 20 33 20 33 5D 3E 3E 5D 3E 3E 3E
3E 3E 3E
I tried taking off the last end dictionary (>>), but Acrobat wouldn't have that. The PDF reading built-in to Google C...
XMLHttpRequest Origin null is not allowed Access-Control-Allow-Origin for file:/// to file:/// (Serv
... use with https://github.com/kripken/sql.js/)
I created a file called base64_data.js (and used btoa() to convert the data that I needed and insert it into a <div> so I could copy it).
var base64_data = "U1FMaXRlIGZvcm1hdCAzAAQA ...<snip lots of data> AhEHwA==";
and then included the ...