Soldier Blog

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c++ fuction

std::cerr std::cerr（console error）是ISO C++标准错误输出流,与std::cout不同，ISO C++要求当cerr被初始化后，cerr.flags() & unitbuf非零（保证流在每次输出操作后被刷新），且cerr.tie()返回&cout。cout对应于标准输出流，默认情况下是显示器。这是一个被缓冲的输出，可以被重定向。cerr对...

Posted by Soldier Blog on May 24, 2016

c++ II

Chapter 2 type conversions assign float to integral,it will truncate.e.g. 3.8->3 assign an out-of-range value to unsigned type,the result is the modulo. assign an out-of-range value to...

Posted by Soldier Blog on May 24, 2016

Dot

编写运行出图进入graph目录，vim test.gv dot -Tpng -O test.gv 语法有向图 1 2 3 4 5 digraph simple { a -> b -> c; b -> d; } note:有向图关键词 digraph；simple图片...

Posted by Soldier Blog on May 24, 2016

Numpy notes

introduce 标准安装的Python中用列表(list)保存一组值，可以用来当作数组使用，不过由于列表的元素可以是任何对象，因此列表中所保存的是对象的指针。这样为了保存一个简单的[1,2,3]，需要有3个指针和三个整数对象。对于数值运算来说这种结构显然比较 **浪费内存和CPU计算**时间. 此外Python还提供了一个array模块，array对象和列表不同，它直接保存数值，和C...

Posted by Soldier Blog on May 23, 2016

Welcome to Jekyll!

You’ll find this post in your _posts directory. Go ahead and edit it and re-build the site to see your changes. You can rebuild the site in many different ways, but the most common way is to run je...

Posted by Soldier Blog on May 23, 2016