在研究opencv，不是很难，但是需要换种思维来认知这个C/C++为编程函数的开源代码库，OK，我现在还是总结一些常用MATLAB的函数，随时更新，下一阶段就是opencv方面的认知了！

1.std

Standard deviation

Syntax
    s = std(X)
    s = std(X,flag)
    s = std(X,flag,dim)

Examples
For matrix X
    X =
    1 5 9
    7 15 22
    s = std(X,0,1)
    s =
    4.2426 7.0711 9.1924
    s = std(X,0,2)
    s =
    4.000
    7.5056

2.reshape

Reshape array

Syntax
    B = reshape(A,m,n)
    B = reshape(A,[m n])
    B = reshape(A,m,n,p,...)
    B = reshape(A,[m n p ...])
    B = reshape(A,...,[],...)

Examples
Reshape a 3-by-4 matrix into a 2-by-6 matrix.
    A =
    1 4 7 10
    2 5 8 11
    3 6 9 12

B = reshape(A,2,6)

B =
    1 3 5 7 9 11
    2 4 6 8 10 12
    B = reshape(A,2,[])

B =
    1 3 5 7 9 11
    2 4 6 8 10 12