Array creation routines

Hint

NumPy API Reference: Array creation routines

Ones and zeros

empty(shape[, dtype, order])	Returns an array without initializing the elements.
empty_like(prototype[, dtype, order, subok, ...])	Returns a new array with same shape and dtype of a given array.
eye(N[, M, k, dtype, order])	Returns a 2-D array with ones on the diagonals and zeros elsewhere.
identity(n[, dtype])	Returns a 2-D identity array.
ones(shape[, dtype, order])	Returns a new array of given shape and dtype, filled with ones.
ones_like(a[, dtype, order, subok, shape])	Returns an array of ones with same shape and dtype as a given array.
zeros(shape[, dtype, order])	Returns a new array of given shape and dtype, filled with zeros.
zeros_like(a[, dtype, order, subok, shape])	Returns an array of zeros with same shape and dtype as a given array.
full(shape, fill_value[, dtype, order])	Returns a new array of given shape and dtype, filled with a given value.
full_like(a, fill_value[, dtype, order, ...])	Returns a full array with same shape and dtype as a given array.

From existing data

array(obj[, dtype, copy, order, subok, ...])	Creates an array on the current device.
asarray(a[, dtype, order, copy, blocking])	Converts an object to array.
asanyarray(a[, dtype, order, copy, blocking])	Converts an object to array.
ascontiguousarray(a[, dtype])	Returns a C-contiguous array.
copy(a[, order])	Creates a copy of a given array on the current device.
frombuffer(*args, **kwargs)	Interpret a buffer as a 1-dimensional array.
fromfile(*args, **kwargs)	Reads an array from a file.
fromfunction(*args, **kwargs)	Construct an array by executing a function over each coordinate.
fromiter(*args, **kwargs)	Create a new 1-dimensional array from an iterable object.
fromstring(*args, **kwargs)	A new 1-D array initialized from text data in a string.
loadtxt(*args, **kwargs)	Load data from a text file.

Numerical ranges

arange(start[, stop, step, dtype])	Returns an array with evenly spaced values within a given interval.
linspace(start, stop[, num, endpoint, ...])	Returns an array with evenly-spaced values within a given interval.
logspace(start, stop[, num, endpoint, base, ...])	Returns an array with evenly-spaced values on a log-scale.
meshgrid(*xi, **kwargs)	Return coordinate matrices from coordinate vectors.
mgrid	Construct a multi-dimensional "meshgrid".
ogrid	Construct a multi-dimensional "meshgrid".

Building matrices

diag(v[, k])	Returns a diagonal or a diagonal array.
diagflat(v[, k])	Creates a diagonal array from the flattened input.
tri(N[, M, k, dtype])	Creates an array with ones at and below the given diagonal.
tril(m[, k])	Returns a lower triangle of an array.
triu(m[, k])	Returns an upper triangle of an array.
vander(x[, N, increasing])	Returns a Vandermonde matrix.