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How can you encode a string to Base64 in JavaScript?
I have a PHP script that can encode a PNG image to a Base64 string.
26 Answers
26
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How does one reorder columns in a data frame?
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354
Your dataframe has four columns like so df[,c(1,2,3,4)].
Note the first comma means keep all the...
Can I use a binary literal in C or C++?
...ort b = BOOST_BINARY( 10010 );
char buf[sizeof(b)*8+1];
printf("hex: %04x, dec: %u, oct: %06o, bin: %16s\n", b, b, b, itoa(b, buf, 2));
cout << setfill('0') <<
"hex: " << hex << setw(4) << b << ", " <<
"dec: " << dec << b << "...
ZeroMQ实例-使用ZMQ(ZeroMQ)进行局域网内网络通信 - C/C++ - 清泛网 - 专注C/C++及内核技术
...idu.com/s/1jGDqXfS
注：在本文写作时，ZMQ版本已经升级到4.1.0，不过影响没多大
2）解压源文件
tar zxf zeromq-4.0.3.tar.gz
3）进入zmq目录并进行编译和安装：
cd zeromq-4.0.3
./configure
make
make install
4）现在开始使用zmq进行网络通...
Get column index from column name in python pandas
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Sure, you can use .get_loc():
In [45]: df = DataFrame({"pear": [1,2,3], "apple": [2,3,4], "orange": [3,4,5]})
In [46]: df.columns
Out[46]: Index([apple, orange, pear], dtype=object)
In [47]: df.columns.get_loc("pear")
Out[47]: 2
although to be honest I do...
Git resolve conflict using --ours/--theirs for all files
...is the usual one.
This method should work through at least Git versions 2.4.x
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Simultaneously merge multiple data.frames in a list
... = 1:3, stringsAsFactors=FALSE)
y <- data.frame(i = c("b","c","d"), k = 4:6, stringsAsFactors=FALSE)
z <- data.frame(i = c("c","d","a"), l = 7:9, stringsAsFactors=FALSE)
Update June 2018: I divided the answer in three sections representing three different ways to perform the merge. You proba...
Is there auto type inferring in Java?
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edited Jul 12 '13 at 4:26
answered Apr 21 '13 at 15:28
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Zip lists in Python
...amine the length of the first element:
In [3]: result = zip(a, b, c)
In [4]: len(result[0])
Out[4]: 3
Of course, this won't work if the lists were empty to start with.
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How do I trim a file extension from a String in Java?
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