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...到30元，应否改变生产计划？
模型代码如下：
max=72*x1+64*x2;
x1+x2<=50;
12*x1+8*x2<=480;
3*x1<=100;
求解这个模型并做灵敏性分析，结果如下。
Global optimal solution found at iteration: 0
Objective value: 3360.0...
Actionbar notification count icon (badge) like Google has
...
I don't like ActionView based solutions,
my idea is:
create a layout with TextView, that TextView will be populated by
application
when you need to draw a MenuItem:
2.1. inflate layout
2.2. call measure() & layout() (otherwise view will be 0...
How can I profile C++ code running on Linux?
... which functions are calling which other functions. It uses standard time based sampling for, uh, time. It then apportions times sampled in a function foo() back to the callers of foo(), in proprtion to the numberr of calls. So it doesn't distinguish between calls of different costs.
...
unable to copy/paste in mingw shell
...
[Alternative] For MINGW64 (mintty 2.7.9) terminal in Windows 10, you can enable "Ctrl+Shift+letter shortcuts" to perform copy with (Ctrl+Shift+c) and paste with (Ctrl+Shift+v).
To enable the feature:
right-click command window
Click on 'Keys'
C...
Python matplotlib multiple bars
...
Diptangsu Goswami
3,64822 gold badges1818 silver badges2929 bronze badges
answered Jan 11 '13 at 2:12
HYRYHYRY
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Environment variables for java installation
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Java SE Development Kit 8u112 on a 64-bit Windows 7 or Windows 8
Set the following user environment variables (== environment variables of type user variables)
JAVA_HOME : C:\Program Files\Java\jdk1.8.0_112
JDK_HOME : %JAVA_HOME%
JRE_HOME : %JAVA_HOME%\jr...
What are the use cases for selecting CHAR over VARCHAR in SQL?
... the space on average as a VARCHAR that's storing mostly characters in the base multilingual plane.
– Gavin Towey
Mar 17 '14 at 17:40
11
...
What is the best algorithm for overriding GetHashCode?
...T, the GetHashCode method is used in a lot of places throughout the .NET base class libraries. Implementing it properly is especially important to find items quickly in a collection or when determining equality.
...
Using npm behind corporate proxy .pac
...
Get the certificate from your browser (Chromes works well). Export it as Base-64 encoded X.509 (.CER)
Replace new lines with \n
Edit your .npmrc add a line ca[]="-----BEGIN CERTIFICATE-----\nXXXX\nXXXX\n-----END CERTIFICATE-----"
Issues
I have noticed tha sometimes npm kind of hangs, so I stop ...
When do I use the PHP constant “PHP_EOL”?
...uses "\n". Someone should file a bug report...
– imgx64
Jan 28 '12 at 7:32
28
@imgx64 Yeah maybe,...