Python学习(五)Numpy通用函数汇总
参考资料:
https://github.com/lijin-THU/notes-python(相应实体书为:《自学Python——编程基础、科学计算及数据分析》)
Numpy通用函数汇总
import numpy as np
1. 三角函数
sin(x)
cos(x)
tan(x)
sinh(x)
conh(x)
tanh(x)
arccos(x)
arctan(x)
arcsin(x)
arccosh(x)
arctanh(x)
arcsinh(x)
arctan2(x,y) //返回
arctan(x/y)
2. 向量操作
dot(x,y)
inner(x,y)
cross(x,y)
vdot(x,y)
outer(x,y)
kron(x,y)
tensordot(x,y[,axis])
3. 其他操作
exp(x)
log(x)
log10(x)
sqrt(x)
absolute(x)
conjugate(x)
negative(x)
ceil(x)
floor(x)
fabs(x)
hypot(x) //返回对应点
(x,y)
到原点的距离fmod(x)
maximum(x,y)
minimum(x,y)
1 x = np.array([1,2,3]) 2 y = np.array([4,5,6]) 3 np.hypot(x,y) #array([ 4.12310563, 5.38516481, 6.70820393])
4. 类型处理
iscomplexobj
iscomplex
isrealobj
isreal
imag
real
real_if_close
isscalar
isneginf //-np.inf 负无穷
isposinf
isinf //检查是否为无穷 np.inf 正无穷
isfinite
isnan //
0/0
会得到nan
,非0值除以0会得到无穷 np.nan 非法值nan_to_num
common_type
typename
注:nan
与任何数进行比较都是 False,想要找出 nan
值需要使用 isnan()
5. 修改形状
atleast_1d
atleast_2d
atleast_3d
expand_dims
apply_over_axes
apply_along_axis
hstack
vstack
dstack
column_stack
hsplit
vsplit
dsplit
split
squeeze
6. 其他有用函数
fix
mod
amax
amin
ptp
sum
cumsum
prod
cumprod
diff
angle
unwrap
sort_complex
trim_zeros
fliplr
flipud
rot90
diag
eye
select
extract
insert
roots
poly
any
all
disp
unique
nansum
nanmax
nanargmax
nanargmin
nanmin
注:nan
开头的函数会进行相应的操作,但是忽略 nan
值