Python: NumPy basic functions

array()

creates a NumPy array from a list or iterable

arange()

returns evenly spaced values within a given range

linspace()

returns evenly spaced numbers over a specified interval

zeros()

creates an array filled with zeros

ones()

creates an array filled with ones

empty()

creates an array without initializing entries (fast, random values inside)

full()

creates an array filled with a given value

eye()

creates an identity matrix

reshape()

changes the shape of an array without changing its data

ravel()

flattens an array into 1D

flatten()

returns a copy of the array flattened into 1D

transpose()

transposes the dimensions of an array

concatenate()

joins arrays along an existing axis

stack()

stacks arrays along a new axis

split()

splits an array into multiple sub-arrays

copy()

returns a copy of an array

dtype()

returns the data type of an array

sum()

returns the sum of array elements

mean()

returns the average of array elements

median()

returns the median of array elements

std()

returns the standard deviation of array elements

var()

returns the variance of array elements

min()

returns the minimum value in an array

max()

returns the maximum value in an array

argmin()

returns the index of the minimum value

argmax()

returns the index of the maximum value

dot()

computes the dot product of two arrays

matmul()

matrix multiplication of two arrays

cross()

returns the cross product of two vectors

inv()

returns the inverse of a matrix

det()

returns the determinant of a matrix

eig()

returns the eigenvalues and eigenvectors of a matrix

where()

returns indices where condition is true

nonzero()

returns indices of non-zero elements

unique()

returns unique elements of an array

sort()

sorts an array

argsort()

returns indices that would sort an array

random.rand()

generates an array of random numbers (uniform distribution)

random.randn()

generates random numbers (normal distribution)

random.randint()

generates random integers in a range

random.choice()

randomly selects elements from an arrayy