函数
以下摘自此博客：http://blog.csdn.net/claroja/article/details/71081369?utm_source=itdadao&utm_medium=referral
三角函数（Trigonometric）
| Function | Describe |
|---|
| sin(x[, out]) |
正弦值 |
| cos(x[, out]) |
余弦值 |
| tan(x[, out]) |
正切值 |
| arcsin(x[, out]) |
反正弦 |
| arccos(x[, out]) |
反余弦 |
| arctan(x[, out]) |
反正切 |
| hypot(x1, x2[, out]) |
求直角三角形斜边 |
| arctan2(x1, x2[, out]) |
Element-wise arc tangent of x1/x2 choosing the quadrant correctly. |
| degrees(x[, out]) |
弧度求角度 |
| radians(x[, out]) |
角度求弧度 |
| unwrap(p[, discont, axis]) |
Unwrap by changing deltas between values to 2*pi complement. |
| deg2rad(x[, out]) |
角度求弧度 |
| rad2deg(x[, out]) |
弧度求角度 |
双曲线函数（Hyperbolic）
| Function | Describe |
|---|
| sinh(x[, out]) |
双曲线正弦 |
| cosh(x[, out]) |
双曲线余弦 |
| tanh(x[, out]) |
双曲线正切 |
| arcsinh(x[, out]) |
反双曲线正弦 |
| arccosh(x[, out]) |
反双曲线余弦 |
| arctanh(x[, out]) |
反双曲线正切 |
四舍五入（Rounding）
| Function | Describe |
|---|
| around(a[, decimals, out]) |
以给定的小数位进行四舍五入 |
| round_(a[, decimals, out]) |
以给定的小数位进行四舍五入，等同于around |
| rint(x[, out]) |
四舍五入到整数 |
| fix(x[, y]) |
向0取整，正数向下取整，负数向上取整 |
| floor(x[, out]) |
向下取整 |
| ceil(x[, out]) |
向上取整 |
| trunc(x[, out]) |
取整数部分 |
和、积、差异（Sums、Products、Differences）
| Function | Describe |
|---|
| prod(a[, axis, dtype, out, keepdims]) |
求积 |
| sum(a[, axis, dtype, out, keepdims]) |
求和 |
| nanprod(a[, axis, dtype, out, keepdims]) |
求积，缺省值为1 |
| nansum(a[, axis, dtype, out, keepdims]) |
求和，缺省值为0 |
| cumprod(a[, axis, dtype, out]) |
累积 |
| cumsum(a[, axis, dtype, out]) |
累和 |
| nancumprod(a[, axis, dtype, out]) |
累积，缺省为1 |
| nancumsum(a[, axis, dtype, out]) |
累和，缺省为0 |
| diff(a[, n, axis]) |
out[n] = a[n+1] - a[n] |
| ediff1d(ary[, to_end, to_begin]) |
The differences between consecutive elements of an array. |
| gradient(f, *varargs, **kwargs) |
Return the gradient of an N-dimensional array. |
| cross(a, b[, axisa, axisb, axisc, axis]) |
Return the cross product of two (arrays of) vectors. |
| trapz(y[, x, dx, axis]) |
Integrate along the given axis using the composite trapezoidal rule. |
指数、对数函数（Exponents&Logarithm）
| Function | Describe |
|---|
| exp(x[, out]) |
指数 |
| expm1(x[, out]) |
exp(x) - 1 |
| exp2(x[, out]) |
2**x |
| log(x[, out]) |
对数 |
| log10(x[, out]) |
以10为底对数 |
| log2(x[, out]) |
以2为底对数. |
| log1p(x[, out]) |
exp(x) - 1 |
| logaddexp(x1, x2[, out]) |
Logarithm of the sum of exponentiations of the inputs. |
| logaddexp2(x1, x2[, out]) |
Logarithm of the sum of exponentiations of the inputs in base-2. |
算术运算
| Function | Describe |
|---|
| add(x1, x2[, out]) |
加法 |
| reciprocal(x[, out]) |
倒数 |
| negative(x[, out]) |
负数 |
| multiply(x1, x2[, out]) |
乘法 |
| divide(x1, x2[, out]) |
除法 |
| power(x1, x2[, out]) |
幂运算 |
| subtract(x1, x2[, out]) |
减法 |
| true_divide(x1, x2[, out]) |
真除法 / |
| floor_divide(x1, x2[, out]) |
向下取整除法 // |
| fmod(x1, x2[, out]) |
求余 |
| mod(x1, x2[, out]) |
求余，余数为正 |
| modf(x[, out1, out2]) |
分别返回整数和余数 |
| remainder(x1, x2[, out]) |
和mod相同 |
其他（Miscellaneous）
| Function | Describe |
|---|
| convolve(a, v[, mode]) |
Returns the discrete, linear convolution of two one-dimensional sequences. |
| clip(a, a_min, a_max[, out]) |
求某一范围的值 |
| sqrt(x[, out]) |
开平方 |
| cbrt(x[, out]) |
开立方 |
| square(x[, out]) |
求平方 |
| absolute(x[, out]) |
绝对值 |
| fabs(x[, out]) |
绝对值 |
| sign(x[, out]) |
标记数字的正负零 |
| maximum(x1, x2[, out]) |
求最大值 |
| minimum(x1, x2[, out]) |
求最小值 |
| fmax(x1, x2[, out]) |
求最大值 |
| fmin(x1, x2[, out]) |
求最小值 |
| nan_to_num(x) |
替换空值 |
| real_if_close(a[, tol]) |
If complex input returns a real array if complex parts are close to zero. |
| interp(x, xp, fp[, left, right, period]) |
One-dimensional linear interpolation.
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