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How do you extract a column from a multi-dimensional array?
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check it out!
a = [[1, 2], [2, 3], [3, 4]]
a2 = zip(*a)
a2[0]
it is the same thing as above except somehow it is neater
the zip does the work but requires single arrays as arguments, the *a syntax unpacks the multidimensional array into single array arguments
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What does send() do in Ruby?
... by example:
o = Object.new
o.send(:to_s) # => "#<Object:0x00005614d7a24fa3>"
# is equivalent to:
o.to_s # => "#<Object:0x00005614d7a24fa3>"
Send lives in the Object class.
What is the benefit of ths?
The benefit of this approach is that you can pass in the method you want to ...
ssl_error_rx_record_too_long and Apache SSL [closed]
...as not enabled in apache 2.... just putting SSLEngine On
I had to execute a2ensite default-ssl and everything worked.
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How to get the difference between two arrays in JavaScript?
...ed to change the for loop to a for .. in loop.
function arr_diff (a1, a2) {
var a = [], diff = [];
for (var i = 0; i < a1.length; i++) {
a[a1[i]] = true;
}
for (var i = 0; i < a2.length; i++) {
if (a[a2[i]]) {
delete a[a2[i]];
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How are multi-dimensional arrays formatted in memory?
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Suppose, we have a1 and a2 defined and initialized like below (c99):
int a1[2][2] = {{142,143}, {144,145}};
int **a2 = (int* []){ (int []){242,243}, (int []){244,245} };
a1 is a homogeneous 2D array with plain continuous layout in memory and expr...
App Inventor 2 网络微数据库后台搭建教程 - 自建TinyWebDB服务 · App Inventor 2 中文网
...et
sudo mkdir -p /opt/tinywebdb
cd /opt/tinywebdb
sudo wget https://www.fun123.cn/reference/creative/tinywebdb_server/tinywebdb-server.zip
sudo unzip -o -j tinywebdb-server.zip
ls
最后的 ls 应当列出 tinywebdb_server.py、tinywebdb.service 等文件。
B4. 设为开机自动运行...
How to update a plot in matplotlib?
... the function as an argument to another like this: "plot_cont(my_function, 123)". There you have me calling plot_cont at line 86: github.com/vitobasso/audio-ml/blob/…
– Vituel
Mar 31 '15 at 1:03
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Finding most changed files in Git
...=format: --name-only > allfiles.csv
then open in excel
A1: FileName
A2: isVisibleFilename >> =IFERROR(IF(C2>0,TRUE,FALSE),FALSE)
A3: DotLocation >> =FIND("@",SUBSTITUTE(A2,".","@",(LEN(A2)-LEN(SUBSTITUTE(A2,".","")))/LEN(".")))
A4: HasExt >> =C2>1
A5: TYPE ...
[since C++11] std::array的使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
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}
// ------------------ copy ------------------
array<int, 5> a2 = a; // copy constructor.
printContainer(a2, "a2: "); // a2: 1 2 3 4 5
array<int, 5> a3(a2); //copy ctor.
printContainer(a3, "a3: "); // a3: 1 2 3 4 5
/...
Array vs. Object efficiency in JavaScript
...s
var a1 = [{id: 29938, name: 'name1'}, {id: 32994, name: 'name1'}];
var a2 = [];
a2[29938] = {id: 29938, name: 'name1'};
a2[32994] = {id: 32994, name: 'name1'};
var o = {};
o['29938'] = {id: 29938, name: 'name1'};
o['32994'] = {id: 32994, name: 'name1'};
for (var f = 0; f < 2000; f++) {
...