In [19]: np.abs(12.0)
Out[19]: 12.0

In [20]: np.abs(12)
Out[20]: 12

In [21]: np.abs(12+5j)  #其中12+5j就是复数，其中12为实数部分，5为虚数部分
Out[21]: 13.0

In [22]: np.abs(12-5j)
Out[22]: 13.0

In [36]: np.sqrt(4)
Out[36]: 2.0

In [37]: np.sqrt(5)
Out[37]: 2.23606797749979

In [38]: np.square(4)
Out[38]: 16

In [39]: np.square(2.6)
Out[39]: 6.760000000000001             

In [40]: np.exp(2)
Out[40]: 7.38905609893065

#python3还有个函数为exp2，计算的是2的指数
In [41]: np.exp2(5)
Out[41]: 32.0

In [42]: np.log(2)
Out[42]: 0.6931471805599453

In [43]: np.log10(0.1)
Out[43]: -1.0

In [44]: np.sign(12)
Out[44]: 1

In [45]: np.sign(-12)
Out[45]: -1

In [46]: np.sign(0)
Out[46]: 0

In [47]: np.ceil(15.971)
Out[47]: 16.0

In [48]: np.floor(-1.564)
Out[48]: -2.0

In [49]: np.floor(1.564)
Out[49]: 1.0

In [50]: np.rint(1.485)
Out[50]: 1.0

In [52]: np.modf([1.5,2.9])
Out[52]: (array([0.5, 0.9]), array([1., 2.]))

In [56]: np.isnan(NaN)
Out[56]: True

In [57]: np.isnan(12)
Out[57]: False

In [61]: np.isfinite(1/3)
Out[61]: True

In [62]: np.isinf(1/3)
Out[62]: False

In [63]: np.isinf(1/2)
Out[63]: False

In [64]: np.isfinite(1/2)
Out[64]: True

In [65]: np.sin(30)
Out[65]: -0.9880316240928618

In [66]: np.sin(1/2)
Out[66]: 0.479425538604203

In [67]: np.sin(1/6)
Out[67]: 0.16589613269341502

In [68]: np.cos(1/3)
Out[68]: 0.9449569463147377

In [71]: np.logical_not(15)
Out[71]: False

In [72]: np.logical_not(-15)
Out[72]: False

In [73]: np.logical_not(-1)
Out[73]: False

In [74]: np.logical_not(0)
Out[74]: True