Python numeric.all方法代码示例

# 需要导入模块: from numpy.core import numeric [as 别名]
# 或者: from numpy.core.numeric import all [as 别名]
def __eq__(self, other):
        if not isinstance(other, poly1d):
            return NotImplemented
        if self.coeffs.shape != other.coeffs.shape:
            return False
        return (self.coeffs == other.coeffs).all() 

# 需要导入模块: from numpy.core import numeric [as 别名]
# 或者: from numpy.core.numeric import all [as 别名]
def __eq__(self, other):
        if self.coeffs.shape != other.coeffs.shape:
            return False
        return (self.coeffs == other.coeffs).all() 

# 需要导入模块: from numpy.core import numeric [as 别名]
# 或者: from numpy.core.numeric import all [as 别名]
def mintypecode(typechars, typeset='GDFgdf', default='d'):
    """
    Return the character for the minimum-size type to which given types can
    be safely cast.

    The returned type character must represent the smallest size dtype such
    that an array of the returned type can handle the data from an array of
    all types in `typechars` (or if `typechars` is an array, then its
    dtype.char).

    Parameters
    ----------
    typechars : list of str or array_like
        If a list of strings, each string should represent a dtype.
        If array_like, the character representation of the array dtype is used.
    typeset : str or list of str, optional
        The set of characters that the returned character is chosen from.
        The default set is 'GDFgdf'.
    default : str, optional
        The default character, this is returned if none of the characters in
        `typechars` matches a character in `typeset`.

    Returns
    -------
    typechar : str
        The character representing the minimum-size type that was found.

    See Also
    --------
    dtype, sctype2char, maximum_sctype

    Examples
    --------
    >>> np.mintypecode(['d', 'f', 'S'])
    'd'
    >>> x = np.array([1.1, 2-3.j])
    >>> np.mintypecode(x)
    'D'

    >>> np.mintypecode('abceh', default='G')
    'G'

    """
    typecodes = [(isinstance(t, str) and t) or asarray(t).dtype.char
                 for t in typechars]
    intersection = [t for t in typecodes if t in typeset]
    if not intersection:
        return default
    if 'F' in intersection and 'd' in intersection:
        return 'D'
    l = [(_typecodes_by_elsize.index(t), t) for t in intersection]
    l.sort()
    return l[0][1] 

# 需要导入模块: from numpy.core import numeric [as 别名]
# 或者: from numpy.core.numeric import all [as 别名]
def real_if_close(a, tol=100):
    """
    If complex input returns a real array if complex parts are close to zero.

    "Close to zero" is defined as `tol` * (machine epsilon of the type for
    `a`).

    Parameters
    ----------
    a : array_like
        Input array.
    tol : float
        Tolerance in machine epsilons for the complex part of the elements
        in the array.

    Returns
    -------
    out : ndarray
        If `a` is real, the type of `a` is used for the output.  If `a`
        has complex elements, the returned type is float.

    See Also
    --------
    real, imag, angle

    Notes
    -----
    Machine epsilon varies from machine to machine and between data types
    but Python floats on most platforms have a machine epsilon equal to
    2.2204460492503131e-16.  You can use 'np.finfo(float).eps' to print
    out the machine epsilon for floats.

    Examples
    --------
    >>> np.finfo(float).eps
    2.2204460492503131e-16

    >>> np.real_if_close([2.1 + 4e-14j], tol=1000)
    array([ 2.1])
    >>> np.real_if_close([2.1 + 4e-13j], tol=1000)
    array([ 2.1 +4.00000000e-13j])

    """
    a = asanyarray(a)
    if not issubclass(a.dtype.type, _nx.complexfloating):
        return a
    if tol > 1:
        from numpy.core import getlimits
        f = getlimits.finfo(a.dtype.type)
        tol = f.eps * tol
    if _nx.all(_nx.absolute(a.imag) < tol):
        a = a.real
    return a 

# 需要导入模块: from numpy.core import numeric [as 别名]
# 或者: from numpy.core.numeric import all [as 别名]
def common_type(*arrays):
    """
    Return a scalar type which is common to the input arrays.

    The return type will always be an inexact (i.e. floating point) scalar
    type, even if all the arrays are integer arrays. If one of the inputs is
    an integer array, the minimum precision type that is returned is a
    64-bit floating point dtype.

    All input arrays except int64 and uint64 can be safely cast to the
    returned dtype without loss of information.

    Parameters
    ----------
    array1, array2, ... : ndarrays
        Input arrays.

    Returns
    -------
    out : data type code
        Data type code.

    See Also
    --------
    dtype, mintypecode

    Examples
    --------
    >>> np.common_type(np.arange(2, dtype=np.float32))
    <type 'numpy.float32'>
    >>> np.common_type(np.arange(2, dtype=np.float32), np.arange(2))
    <type 'numpy.float64'>
    >>> np.common_type(np.arange(4), np.array([45, 6.j]), np.array([45.0]))
    <type 'numpy.complex128'>

    """
    is_complex = False
    precision = 0
    for a in arrays:
        t = a.dtype.type
        if iscomplexobj(a):
            is_complex = True
        if issubclass(t, _nx.integer):
            p = 2  # array_precision[_nx.double]
        else:
            p = array_precision.get(t, None)
            if p is None:
                raise TypeError("can't get common type for non-numeric array")
        precision = max(precision, p)
    if is_complex:
        return array_type[1][precision]
    else:
        return array_type[0][precision] 

# 需要导入模块: from numpy.core import numeric [as 别名]
# 或者: from numpy.core.numeric import all [as 别名]
def mintypecode(typechars,typeset='GDFgdf',default='d'):
    """
    Return the character for the minimum-size type to which given types can
    be safely cast.

    The returned type character must represent the smallest size dtype such
    that an array of the returned type can handle the data from an array of
    all types in `typechars` (or if `typechars` is an array, then its
    dtype.char).

    Parameters
    ----------
    typechars : list of str or array_like
        If a list of strings, each string should represent a dtype.
        If array_like, the character representation of the array dtype is used.
    typeset : str or list of str, optional
        The set of characters that the returned character is chosen from.
        The default set is 'GDFgdf'.
    default : str, optional
        The default character, this is returned if none of the characters in
        `typechars` matches a character in `typeset`.

    Returns
    -------
    typechar : str
        The character representing the minimum-size type that was found.

    See Also
    --------
    dtype, sctype2char, maximum_sctype

    Examples
    --------
    >>> np.mintypecode(['d', 'f', 'S'])
    'd'
    >>> x = np.array([1.1, 2-3.j])
    >>> np.mintypecode(x)
    'D'

    >>> np.mintypecode('abceh', default='G')
    'G'

    """
    typecodes = [(isinstance(t, str) and t) or asarray(t).dtype.char
                 for t in typechars]
    intersection = [t for t in typecodes if t in typeset]
    if not intersection:
        return default
    if 'F' in intersection and 'd' in intersection:
        return 'D'
    l = []
    for t in intersection:
        i = _typecodes_by_elsize.index(t)
        l.append((i, t))
    l.sort()
    return l[0][1] 

# 需要导入模块: from numpy.core import numeric [as 别名]
# 或者: from numpy.core.numeric import all [as 别名]
def real_if_close(a,tol=100):
    """
    If complex input returns a real array if complex parts are close to zero.

    "Close to zero" is defined as `tol` * (machine epsilon of the type for
    `a`).

    Parameters
    ----------
    a : array_like
        Input array.
    tol : float
        Tolerance in machine epsilons for the complex part of the elements
        in the array.

    Returns
    -------
    out : ndarray
        If `a` is real, the type of `a` is used for the output.  If `a`
        has complex elements, the returned type is float.

    See Also
    --------
    real, imag, angle

    Notes
    -----
    Machine epsilon varies from machine to machine and between data types
    but Python floats on most platforms have a machine epsilon equal to
    2.2204460492503131e-16.  You can use 'np.finfo(float).eps' to print
    out the machine epsilon for floats.

    Examples
    --------
    >>> np.finfo(float).eps
    2.2204460492503131e-16

    >>> np.real_if_close([2.1 + 4e-14j], tol=1000)
    array([ 2.1])
    >>> np.real_if_close([2.1 + 4e-13j], tol=1000)
    array([ 2.1 +4.00000000e-13j])

    """
    a = asanyarray(a)
    if not issubclass(a.dtype.type, _nx.complexfloating):
        return a
    if tol > 1:
        from numpy.core import getlimits
        f = getlimits.finfo(a.dtype.type)
        tol = f.eps * tol
    if _nx.all(_nx.absolute(a.imag) < tol):
        a = a.real
    return a 

# 需要导入模块: from numpy.core import numeric [as 别名]
# 或者: from numpy.core.numeric import all [as 别名]
def real_if_close(a,tol=100):
    """
    If complex input returns a real array if complex parts are close to zero.

    "Close to zero" is defined as `tol` * (machine epsilon of the type for
    `a`).

    Parameters
    ----------
    a : array_like
        Input array.
    tol : float
        Tolerance in machine epsilons for the complex part of the elements
        in the array.

    Returns
    -------
    out : ndarray
        If `a` is real, the type of `a` is used for the output.  If `a`
        has complex elements, the returned type is float.

    See Also
    --------
    real, imag, angle

    Notes
    -----
    Machine epsilon varies from machine to machine and between data types
    but Python floats on most platforms have a machine epsilon equal to
    2.2204460492503131e-16.  You can use 'np.finfo(np.float).eps' to print
    out the machine epsilon for floats.

    Examples
    --------
    >>> np.finfo(np.float).eps
    2.2204460492503131e-16

    >>> np.real_if_close([2.1 + 4e-14j], tol=1000)
    array([ 2.1])
    >>> np.real_if_close([2.1 + 4e-13j], tol=1000)
    array([ 2.1 +4.00000000e-13j])

    """
    a = asanyarray(a)
    if not issubclass(a.dtype.type, _nx.complexfloating):
        return a
    if tol > 1:
        from numpy.core import getlimits
        f = getlimits.finfo(a.dtype.type)
        tol = f.eps * tol
    if _nx.all(_nx.absolute(a.imag) < tol):
        a = a.real
    return a 

# 需要导入模块: from numpy.core import numeric [as 别名]
# 或者: from numpy.core.numeric import all [as 别名]
def common_type(*arrays):
    """
    Return a scalar type which is common to the input arrays.

    The return type will always be an inexact (i.e. floating point) scalar
    type, even if all the arrays are integer arrays. If one of the inputs is
    an integer array, the minimum precision type that is returned is a
    64-bit floating point dtype.

    All input arrays can be safely cast to the returned dtype without loss
    of information.

    Parameters
    ----------
    array1, array2, ... : ndarrays
        Input arrays.

    Returns
    -------
    out : data type code
        Data type code.

    See Also
    --------
    dtype, mintypecode

    Examples
    --------
    >>> np.common_type(np.arange(2, dtype=np.float32))
    <type 'numpy.float32'>
    >>> np.common_type(np.arange(2, dtype=np.float32), np.arange(2))
    <type 'numpy.float64'>
    >>> np.common_type(np.arange(4), np.array([45, 6.j]), np.array([45.0]))
    <type 'numpy.complex128'>

    """
    is_complex = False
    precision = 0
    for a in arrays:
        t = a.dtype.type
        if iscomplexobj(a):
            is_complex = True
        if issubclass(t, _nx.integer):
            p = 2  # array_precision[_nx.double]
        else:
            p = array_precision.get(t, None)
            if p is None:
                raise TypeError("can't get common type for non-numeric array")
        precision = max(precision, p)
    if is_complex:
        return array_type[1][precision]
    else:
        return array_type[0][precision] 

# 需要导入模块: from numpy.core import numeric [as 别名]
# 或者: from numpy.core.numeric import all [as 别名]
def common_type(*arrays):
    """
    Return a scalar type which is common to the input arrays.

    The return type will always be an inexact (i.e. floating point) scalar
    type, even if all the arrays are integer arrays. If one of the inputs is
    an integer array, the minimum precision type that is returned is a
    64-bit floating point dtype.

    All input arrays except int64 and uint64 can be safely cast to the 
    returned dtype without loss of information.

    Parameters
    ----------
    array1, array2, ... : ndarrays
        Input arrays.

    Returns
    -------
    out : data type code
        Data type code.

    See Also
    --------
    dtype, mintypecode

    Examples
    --------
    >>> np.common_type(np.arange(2, dtype=np.float32))
    <type 'numpy.float32'>
    >>> np.common_type(np.arange(2, dtype=np.float32), np.arange(2))
    <type 'numpy.float64'>
    >>> np.common_type(np.arange(4), np.array([45, 6.j]), np.array([45.0]))
    <type 'numpy.complex128'>

    """
    is_complex = False
    precision = 0
    for a in arrays:
        t = a.dtype.type
        if iscomplexobj(a):
            is_complex = True
        if issubclass(t, _nx.integer):
            p = 2  # array_precision[_nx.double]
        else:
            p = array_precision.get(t, None)
            if p is None:
                raise TypeError("can't get common type for non-numeric array")
        precision = max(precision, p)
    if is_complex:
        return array_type[1][precision]
    else:
        return array_type[0][precision]