说明：用STL实现简单运算表达式，其中包括加减乘除等，以输入等号为结束标志。
Simple arithmetic expressions, including addition, subtraction, etc. , to enter an equal sign marks the end of the STL.
介绍采用引用计数、操作标志等方法实现矩阵复制、转置、乘常数等部分矩阵运算。
Then the methods of the adoption to quote from to count, operating the marking etc are introduced.
HOUGH变换圆检测法涉及复杂运算量，同时需要预先给定一些限制条件，对于交通标志的实时检测有一定局限性；
The HOUGH transform circle detection method involves complex computation, and needs to set some restrictions in advance, which have certain limitations for real-time traffic signs detection.
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