常用的Numpy通用函数列表
官网来源：Universal functions (ufunc) — NumPy v1.21 Manual
数学运算（Math operations）
| 表达式 | 定义 |
|---|---|
add(x1, x2, /[, out, where, casting, order, …]) |
Add arguments element-wise. |
subtract(x1, x2, /[, out, where, casting, …]) |
Subtract arguments, element-wise. |
multiply(x1, x2, /[, out, where, casting, …]) |
Multiply arguments element-wise. |
matmul(x1, x2, /[, out, casting, order, …]) |
Matrix product of two arrays. |
divide(x1, x2, /[, out, where, casting, …]) |
Returns a true division of the inputs, element-wise. |
logaddexp(x1, x2, /[, out, where, casting, …]) |
Logarithm of the sum of exponentiations of the inputs. |
logaddexp2(x1, x2, /[, out, where, casting, …]) |
Logarithm of the sum of exponentiations of the inputs in base-2. |
true_divide(x1, x2, /[, out, where, …]) |
Returns a true division of the inputs, element-wise. |
floor_divide(x1, x2, /[, out, where, …]) |
Return the largest integer smaller or equal to the division of the inputs. |
negative(x, /[, out, where, casting, order, …]) |
Numerical negative, element-wise. |
positive(x, /[, out, where, casting, order, …]) |
Numerical positive, element-wise. |
power(x1, x2, /[, out, where, casting, …]) |
First array elements raised to powers from second array, element-wise. |
float_power(x1, x2, /[, out, where, …]) |
First array elements raised to powers from second array, element-wise. |
remainder(x1, x2, /[, out, where, casting, …]) |
Return element-wise remainder of division. |
mod(x1, x2, /[, out, where, casting, order, …]) |
Return element-wise remainder of division. |
fmod(x1, x2, /[, out, where, casting, …]) |
Return the element-wise remainder of division. |
divmod(x1, x2[, out1, out2], / [[, out, …]) |
Return element-wise quotient and remainder simultaneously. |
absolute(x, /[, out, where, casting, order, …]) |
Calculate the absolute value element-wise. |
fabs(x, /[, out, where, casting, order, …]) |
Compute the absolute values element-wise. |
rint(x, /[, out, where, casting, order, …]) |
Round elements of the array to the nearest integer. |
sign(x, /[, out, where, casting, order, …]) |
Returns an element-wise indication of the sign of a number. |
heaviside(x1, x2, /[, out, where, casting, …]) |
Compute the Heaviside step function. |
conj(x, /[, out, where, casting, order, …]) |
Return the complex conjugate, element-wise. |
conjugate(x, /[, out, where, casting, …]) |
Return the complex conjugate, element-wise. |
exp(x, /[, out, where, casting, order, …]) |
Calculate the exponential of all elements in the input array. |
exp2(x, /[, out, where, casting, order, …]) |
Calculate 2**p for all p in the input array. |
log(x, /[, out, where, casting, order, …]) |
Natural logarithm, element-wise. |
log2(x, /[, out, where, casting, order, …]) |
Base-2 logarithm of x. |
log10(x, /[, out, where, casting, order, …]) |
Return the base 10 logarithm of the input array, element-wise. |
expm1(x, /[, out, where, casting, order, …]) |
Calculate exp(x) - 1 for all elements in the array. |
log1p(x, /[, out, where, casting, order, …]) |
Return the natural logarithm of one plus the input array, element-wise. |
sqrt(x, /[, out, where, casting, order, …]) |
Return the non-negative square-root of an array, element-wise. |
square(x, /[, out, where, casting, order, …]) |
Return the element-wise square of the input. |
cbrt(x, /[, out, where, casting, order, …]) |
Return the cube-root of an array, element-wise. |
reciprocal(x, /[, out, where, casting, …]) |
Return the reciprocal of the argument, element-wise. |
gcd(x1, x2, /[, out, where, casting, order, …]) |
Returns the greatest common divisor of ` |
lcm(x1, x2, /[, out, where, casting, order, …]) |
Returns the lowest common multiple of ` |
三角函数（Trigonometric functions）
All trigonometric functions use radians when an angle is called for. The ratio of degrees to radians is 180∘/π.
| 表达式 | 定义 |
|---|---|
sin(x, /[, out, where, casting, order, …]) |
Trigonometric sine, element-wise. |
cos(x, /[, out, where, casting, order, …]) |
Cosine element-wise. |
tan(x, /[, out, where, casting, order, …]) |
Compute tangent element-wise. |
arcsin(x, /[, out, where, casting, order, …]) |
Inverse sine, element-wise. |
arccos(x, /[, out, where, casting, order, …]) |
Trigonometric inverse cosine, element-wise. |
arctan(x, /[, out, where, casting, order, …]) |
Trigonometric inverse tangent, element-wise. |
arctan2(x1, x2, /[, out, where, casting, …]) |
Element-wise arc tangent of x1/x2 choosing the quadrant correctly. |
hypot(x1, x2, /[, out, where, casting, …]) |
Given the “legs” of a right triangle, return its hypotenuse. |
sinh(x, /[, out, where, casting, order, …]) |
Hyperbolic sine, element-wise. |
cosh(x, /[, out, where, casting, order, …]) |
Hyperbolic cosine, element-wise. |
tanh(x, /[, out, where, casting, order, …]) |
Compute hyperbolic tangent element-wise. |
arcsinh(x, /[, out, where, casting, order, …]) |
Inverse hyperbolic sine element-wise. |
arccosh(x, /[, out, where, casting, order, …]) |
Inverse hyperbolic cosine, element-wise. |
arctanh(x, /[, out, where, casting, order, …]) |
Inverse hyperbolic tangent element-wise. |
degrees(x, /[, out, where, casting, order, …]) |
Convert angles from radians to degrees. |
radians(x, /[, out, where, casting, order, …]) |
Convert angles from degrees to radians. |
deg2rad(x, /[, out, where, casting, order, …]) |
Convert angles from degrees to radians. |
rad2deg(x, /[, out, where, casting, order, …]) |
Convert angles from radians to degrees. |
逻辑函数（Comparison functions）
Warning
Do not use the Python keywords and and or to combine logical array expressions. These keywords will test the truth value of the entire array (not element-by-element as you might expect). Use the bitwise operators & and | instead.
| 表达式 | 定义 |
|---|---|
greater(x1, x2, /[, out, where, casting, …]) |
Return the truth value of (x1 > x2) element-wise. |
greater_equal(x1, x2, /[, out, where, …]) |
Return the truth value of (x1 >= x2) element-wise. |
less(x1, x2, /[, out, where, casting, …]) |
Return the truth value of (x1 < x2) element-wise. |
less_equal(x1, x2, /[, out, where, casting, …]) |
Return the truth value of (x1 <= x2) element-wise. |
not_equal(x1, x2, /[, out, where, casting, …]) |
Return (x1 != x2) element-wise. |
equal(x1, x2, /[, out, where, casting, …]) |
Return (x1 == x2) element-wise. |
logical_and(x1, x2, /[, out, where, …]) |
Compute the truth value of x1 AND x2 element-wise. |
logical_or(x1, x2, /[, out, where, casting, …]) |
Compute the truth value of x1 OR x2 element-wise. |
logical_xor(x1, x2, /[, out, where, …]) |
Compute the truth value of x1 XOR x2, element-wise. |
logical_not(x, /[, out, where, casting, …]) |
Compute the truth value of NOT x element-wise. |
maximum(x1, x2, /[, out, where, casting, …]) |
Element-wise maximum of array elements. |
minimum(x1, x2, /[, out, where, casting, …]) |
Element-wise minimum of array elements. |
fmax(x1, x2, /[, out, where, casting, …]) |
Element-wise maximum of array elements. |
fmin(x1, x2, /[, out, where, casting, …]) |
Element-wise minimum of array elements. |
