Matlab基本函数-log10函数

1、log10函数：求以10为底的对数

2、用法说明

      y = log10(x) 函数对数组x的元素逐个进行以10为底的对数运算。y = a+b*i，有log10(y) = log10(abs(y))+i*atan2(b,a)

3、举例说明

>> x = 20

x =

    20

>> y = log10(x)

y =

    1.3010

>> x = 1:20

x =

  Columns 1 through 17

     1     2     3     4     5     6     7     8     9    10    11    12    13    14    15    16    17

  Columns 18 through 20

    18    19    20

>> y = log10(x)

y =

  Columns 1 through 10

         0    0.3010    0.4771    0.6021    0.6990    0.7782    0.8451    0.9031    0.9542    1.0000

  Columns 11 through 20

    1.0414    1.0792    1.1139    1.1461    1.1761    1.2041    1.2304    1.2553    1.2788    1.3010

>> x = [34-45i 12+23i 56+78i 26.12-45.89i]

x =

  34.0000 -45.0000i  12.0000 +23.0000i  56.0000 +78.0000i  26.1200 -45.8900i

>> y = log10(x)

y =

   1.7513 - 0.4012i   1.4140 + 0.4733i   1.9824 + 0.4118i   1.7227 - 0.4575i