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__all__ = ['ones', 'empty', 'identity', 'zeros', 'eye', 'tri']
import numpy.core.multiarray as mu
import numpy.core.numeric as nn
def ones(shape, dtype=int, order='C'):
"""ones(shape, dtype=int) returns an array of the given
dimensions which is initialized to all ones.
"""
a = mu.empty(shape, dtype, order)
a.fill(1)
return a
def zeros(shape, dtype=int, order='C'):
"""zeros(shape, dtype=int) returns an array of the given
dimensions which is initialized to all zeros
"""
return mu.zeros(shape, dtype, order)
def identity(n,dtype=int):
"""identity(n) returns the identity 2-d array of shape n x n.
"""
return nn.identity(n, dtype)
def eye(N, M=None, k=0, dtype=int):
""" eye returns a N-by-M 2-d array where the k-th diagonal is all ones,
and everything else is zeros.
"""
if M is None: M = N
m = equal(subtract.outer(arange(N), arange(M)),-k)
if m.dtype != dtype:
return m.astype(dtype)
def tri(N, M=None, k=0, dtype=int):
""" returns a N-by-M array where all the diagonals starting from
lower left corner up to the k-th are all ones.
"""
if M is None: M = N
m = greater_equal(subtract.outer(arange(N), arange(M)),-k)
if m.dtype != dtype:
return m.astype(dtype)
def empty(shape, dtype=int, order='C'):
return mu.empty(shape, dtype, order)
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