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Print all but the first three columns
...,$i OFS; if(NF) printf "%s",$NF; printf ORS}'
### Example ###
$ echo '1 2 3 4 5 6 7' |
awk '{for(i=4;i<NF;i++)printf"%s",$i OFS;if(NF)printf"%s",$NF;printf ORS}' |
tr ' ' '-'
4-5-6-7
Sudo_O proposes an elegant improvement using the ternary operator NF?ORS:OFS
$ echo '1 2 3 4 5 6 7' |
aw...
How to initialize an array in one step using Ruby?
...
You can use an array literal:
array = [ '1', '2', '3' ]
You can also use a range:
array = ('1'..'3').to_a # parentheses are required
# or
array = *('1'..'3') # parentheses not required, but included for clarity
For arrays of whitespace-delimited strings, you can us...
Insert an element at a specific index in a list and return the updated list
...] + a[index:].
However, another way is:
a = [1, 2, 4]
b = a[:]
b.insert(2, 3)
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Filter rows which contain a certain string
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263
The answer to the question was already posted by the @latemail in the comments above. You can us...
Regular Expression to reformat a US phone number in Javascript
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233
Assuming you want the format "(123) 456-7890":
function formatPhoneNumber(phoneNumberString) {...
Divide a number by 3 without using *, /, +, -, % operators
How would you divide a number by 3 without using * , / , + , - , % , operators?
48 Answers
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What does ** (double star/asterisk) and * (star/asterisk) do for parameters?
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2343
The *args and **kwargs is a common idiom to allow arbitrary number of arguments to functions a...
[since C++11] std::array的使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...类、没有虚函数.
因此不支持这样的构造方法：array<int, 3> a({1, 2, 4});
初始化array最常用的方法是使用赋值运算符和初始化列表：
array<int, 3> a = {1, 2, 3};
array<int, 100> b = {1, 2, 3}; // a[0] ~ a[2] = 1, 2, 3; a[3] ~ a[99] = 0, 0, 0 ... 0;
array<in...
StringIO in Python3
I am using Python 3.2.1 and I can't import the StringIO module. I use
io.StringIO and it works, but I can't use it with numpy 's genfromtxt like this:
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LINGO使用指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...如下的LP问题：
在模型窗口中输入如下代码：
min=2*x1+3*x2;
x1+x2>=350;
x1>=100;
2*x1+x2<=600;
然后点击工具条上的按钮 即可。
例1.2 使用LINGO软件计算6个发点8个收点的最小费用运输问题。产销单位运价如下表。
销地
...