def prep_simple(simple_type, dtype):
"""Given a ctypes simple type, construct and attach an
__array_interface__ property to it if it does not yet have one.
"""
try:
simple_type.__array_interface__
except AttributeError:
pass
else:
return
typestr = _dtype(dtype).str
_typecodes[typestr] = simple_type
def __array_interface__(self):
return {
"descr": [("", typestr)],
"__ref": self,
"strides": None,
"shape": (),
"version": 3,
"typestr": typestr,
"data": (ct.addressof(self), False),
}
simple_type.__array_interface__ = property(__array_interface__)
def op_t_pz(opstr,indx,J,dtype,pauli,N,m,basis,L,**blocks):
a=blocks.get("a")
kblock=blocks.get("kblock")
pzblock=blocks.get("pzblock")
char = _dtype(dtype).char
compiled_op = basis_ops.__dict__[char+"_t_pz_op"]
col,ME,error = compiled_op(N,m,basis,opstr,indx,J,L,pzblock,kblock,a)
if error != 0: raise OpstrError(_basis_op_errors[error])
row=_np.arange(len(basis),dtype=_index_type)
row=_np.concatenate((row,row))
mask = col >= 0
row = row[ mask ]
col = col[ mask ]
ME = ME[ mask ]
# print col,ME
if not pauli:
Nop = len(opstr.replace("I",""))
ME /= 2.0**(Nop)
return ME,row,col
def as_ctypes_type(dtype):
"""
Convert a dtype into a ctypes type.
Parameters
----------
dtype : dtype
The dtype to convert
Returns
-------
ctypes
A ctype scalar, union, array, or struct
Raises
------
NotImplementedError
If the conversion is not possible
Notes
-----
This function does not losslessly round-trip in either direction.
``np.dtype(as_ctypes_type(dt))`` will:
- insert padding fields
- reorder fields to be sorted by offset
- discard field titles
``as_ctypes_type(np.dtype(ctype))`` will:
- discard the class names of ``Structure``s and ``Union``s
- convert single-element ``Union``s into single-element ``Structure``s
- insert padding fields
"""
return _ctype_from_dtype(_dtype(dtype))
def op_t_p_z(opstr,indx,J,dtype,N,m,basis,L,**blocks):
a=blocks.get("a")
kblock=blocks.get("kblock")
pblock=blocks.get("pblock")
zblock=blocks.get("zblock")
pauli=blocks.get("pauli")
char = _dtype(dtype).char
compiled_op = basis_ops.__dict__[char+"_t_p_z_op"]
row,ME,error = compiled_op(N,m,basis,opstr,indx,J,L,pblock,zblock,kblock,a)
if error != 0: raise OpstrError(_basis_op_errors[error])
col = _np.arange(len(basis),dtype=_index_type)
col=_np.concatenate((col,col))
mask = row >= 0
col = col[ mask ]
row = row[ mask ]
ME = ME[ mask ]
if not pauli:
Nop = len(opstr.replace("I",""))
ME /= 2.0**(Nop)
return ME,row,col
def op(opstr,indx,J,dtype,basis,**blocks):
char = _dtype(dtype).char
compiled_op = basis_ops.__dict__[char+"_spinop"]
pauli = blocks.get('pauli')
# row: resilting basis states; -1: state is thrown out (cf FindZState)
# ME: array of dtype with matrix elements
# error: see line 11 above
row,ME,error = compiled_op(basis,opstr,indx,J)
if error != 0: raise OpstrError(_basis_op_errors[error])
col = _np.arange(len(basis),dtype=_index_type)
mask = row >= 0
col = col[ mask ]
row = row[ mask ]
ME = ME[ mask ]
if not pauli:
Nop = len(opstr.replace("I",""))
ME /= 2.0**(Nop)
return ME,row,col
def contents(self):
"""
Get an ndarray viewing the data pointed to by this pointer.
This mirrors the `contents` attribute of a normal ctypes pointer
"""
full_dtype = _dtype((self._dtype_, self._shape_))
full_ctype = ctypes.c_char * full_dtype.itemsize
buffer = ctypes.cast(self, ctypes.POINTER(full_ctype)).contents
return frombuffer(buffer, dtype=full_dtype).squeeze(axis=0)
def _get_typecodes():
""" Return a dictionary mapping __array_interface__ formats to ctypes types """
ct = ctypes
simple_types = [
ct.c_byte, ct.c_short, ct.c_int, ct.c_long, ct.c_longlong,
ct.c_ubyte, ct.c_ushort, ct.c_uint, ct.c_ulong, ct.c_ulonglong,
ct.c_float, ct.c_double,
]
return {_dtype(ctype).str: ctype for ctype in simple_types}
def _get_scalar_type_map():
"""
Return a dictionary mapping native endian scalar dtype to ctypes types
"""
ct = ctypes
simple_types = [
ct.c_byte, ct.c_short, ct.c_int, ct.c_long, ct.c_longlong,
ct.c_ubyte, ct.c_ushort, ct.c_uint, ct.c_ulong, ct.c_ulonglong,
ct.c_float, ct.c_double,
ct.c_bool,
]
return {_dtype(ctype): ctype for ctype in simple_types}
def as_ctypes(obj):
"""Create and return a ctypes object from a numpy array. Actually
anything that exposes the __array_interface__ is accepted."""
ai = obj.__array_interface__
if ai["strides"]:
raise TypeError("strided arrays not supported")
if ai["version"] != 3:
raise TypeError("only __array_interface__ version 3 supported")
addr, readonly = ai["data"]
if readonly:
raise TypeError("readonly arrays unsupported")
dtype = _dtype((ai["typestr"], ai["shape"]))
result = as_ctypes_type(dtype).from_address(addr)
result.__keep = obj
return result
def prep_pointer(pointer_obj, shape):
"""Given a ctypes pointer object, construct and
attach an __array_interface__ property to it if it does not
yet have one.
"""
try: pointer_obj.__array_interface__
except AttributeError: pass
else: return
contents = pointer_obj.contents
dtype = _dtype(type(contents))
inter = {'version': 3,
'typestr': dtype.str,
'data': (ct.addressof(contents), False),
'shape': shape}
pointer_obj.__array_interface__ = inter
def op_m(opstr,indx,J,dtype,pauli,basis,**blocks):
char = _dtype(dtype).char
compiled_op = basis_ops.__dict__[char+"_m_op"]
col,ME,error = compiled_op(basis,opstr,indx,J)
if error != 0: raise OpstrError(_basis_op_errors[error])
row=_np.arange(len(basis),dtype=_index_type)
mask = col >= 0
row = row[ mask ]
col = col[ mask ]
ME = ME[ mask ]
if not pauli:
Nop = len(opstr.replace("I",""))
ME /= 2.0**(Nop)
return ME,row,col
def prep_simple(simple_type, dtype):
"""Given a ctypes simple type, construct and attach an
__array_interface__ property to it if it does not yet have one.
"""
try: simple_type.__array_interface__
except AttributeError: pass
else: return
typestr = _dtype(dtype).str
_typecodes[typestr] = simple_type
def __array_interface__(self):
return {'descr': [('', typestr)],
'__ref': self,
'strides': None,
'shape': (),
'version': 3,
'typestr': typestr,
'data': (ct.addressof(self), False),
}
simple_type.__array_interface__ = property(__array_interface__)
def op_pz(opstr,indx,J,dtype,N,basis,L,**blocks):
pzblock=blocks.get("pzblock")
pauli=blocks.get("pauli")
char = _dtype(dtype).char
compiled_op = basis_ops.__dict__[char+"_pz_op"]
row,ME,error = compiled_op(N,basis,opstr,indx,J,L,pzblock)
if error != 0: raise OpstrError(_basis_op_errors[error])
col = _np.arange(len(basis),dtype=_index_type)
mask = row >= 0
col = col[ mask ]
row = row[ mask ]
ME = ME[ mask ]
if not pauli:
Nop = len(opstr.replace("I",""))
ME /= 2.0**(Nop)
return ME,row,col
def ndpointer(dtype=None, ndim=None, shape=None, flags=None):
"""
Array-checking restype/argtypes.
An ndpointer instance is used to describe an ndarray in restypes
and argtypes specifications. This approach is more flexible than
using, for example, ``POINTER(c_double)``, since several restrictions
can be specified, which are verified upon calling the ctypes function.
These include data type, number of dimensions, shape and flags. If a
given array does not satisfy the specified restrictions,
a ``TypeError`` is raised.
Parameters
----------
dtype : data-type, optional
Array data-type.
ndim : int, optional
Number of array dimensions.
shape : tuple of ints, optional
Array shape.
flags : str or tuple of str
Array flags; may be one or more of:
- C_CONTIGUOUS / C / CONTIGUOUS
- F_CONTIGUOUS / F / FORTRAN
- OWNDATA / O
- WRITEABLE / W
- ALIGNED / A
- UPDATEIFCOPY / U
Returns
-------
klass : ndpointer type object
A type object, which is an ``_ndtpr`` instance containing
dtype, ndim, shape and flags information.
Raises
------
TypeError
If a given array does not satisfy the specified restrictions.
Examples
--------
>>> clib.somefunc.argtypes = [np.ctypeslib.ndpointer(dtype=np.float64,
... ndim=1,
... flags='C_CONTIGUOUS')]
>>> clib.somefunc(np.array([1, 2, 3], dtype=np.float64))
"""
if dtype is not None:
dtype = _dtype(dtype)
num = None
if flags is not None:
if isinstance(flags, str):
flags = flags.split(',')
elif isinstance(flags, (int, integer)):
num = flags
flags = _flags_fromnum(num)
elif isinstance(flags, flagsobj):
num = flags.num
flags = _flags_fromnum(num)
if num is None:
try:
flags = [x.strip().upper() for x in flags]
except:
raise TypeError, "invalid flags specification"
num = _num_fromflags(flags)
try:
return _pointer_type_cache[(dtype, ndim, shape, num)]
except KeyError:
pass
if dtype is None:
name = 'any'
elif dtype.names:
name = str(id(dtype))
else:
name = dtype.str
if ndim is not None:
name += "_%dd" % ndim
if shape is not None:
try:
strshape = [str(x) for x in shape]
except TypeError:
strshape = [str(shape)]
shape = (shape,)
shape = tuple(shape)
name += "_"+"x".join(strshape)
if flags is not None:
name += "_"+"_".join(flags)
else:
flags = []
klass = type("ndpointer_%s"%name, (_ndptr,),
{"_dtype_": dtype,
"_shape_" : shape,
"_ndim_" : ndim,
"_flags_" : num})
_pointer_type_cache[dtype] = klass
return klass
def ndpointer(dtype=None, ndim=None, shape=None, flags=None):
"""Array-checking restype/argtypes.
An ndpointer instance is used to describe an ndarray in restypes
and argtypes specifications. This approach is more flexible than
using, for example,
POINTER(c_double)
since several restrictions can be specified, which are verified
upon calling the ctypes function. These include data type
(dtype), number of dimensions (ndim), shape and flags (e.g.
'C_CONTIGUOUS' or 'F_CONTIGUOUS'). If a given array does not satisfy the
specified restrictions, a TypeError is raised.
Example:
clib.somefunc.argtypes = [ndpointer(dtype=float64,
ndim=1,
flags='C_CONTIGUOUS')]
clib.somefunc(array([1,2,3],dtype=float64))
"""
if dtype is not None:
dtype = _dtype(dtype)
num = None
if flags is not None:
if isinstance(flags, str):
flags = flags.split(',')
elif isinstance(flags, (int, integer)):
num = flags
flags = _flags_fromnum(num)
elif isinstance(flags, flagsobj):
num = flags.num
flags = _flags_fromnum(num)
if num is None:
try:
flags = [x.strip().upper() for x in flags]
except:
raise TypeError, "invalid flags specification"
num = _num_fromflags(flags)
try:
return _pointer_type_cache[(dtype, ndim, shape, num)]
except KeyError:
pass
if dtype is None:
name = 'any'
elif dtype.names:
name = str(id(dtype))
else:
name = dtype.str
if ndim is not None:
name += "_%dd" % ndim
if shape is not None:
try:
strshape = [str(x) for x in shape]
except TypeError:
strshape = [str(shape)]
shape = (shape,)
shape = tuple(shape)
name += "_"+"x".join(strshape)
if flags is not None:
name += "_"+"_".join(flags)
else:
flags = []
klass = type("ndpointer_%s"%name, (_ndptr,),
{"_dtype_": dtype,
"_shape_" : shape,
"_ndim_" : ndim,
"_flags_" : num})
_pointer_type_cache[dtype] = klass
return klass
def ndpointer(dtype=None, ndim=None, shape=None, flags=None):
"""
Array-checking restype/argtypes.
An ndpointer instance is used to describe an ndarray in restypes
and argtypes specifications. This approach is more flexible than
using, for example, ``POINTER(c_double)``, since several restrictions
can be specified, which are verified upon calling the ctypes function.
These include data type, number of dimensions, shape and flags. If a
given array does not satisfy the specified restrictions,
a ``TypeError`` is raised.
Parameters
----------
dtype : data-type, optional
Array data-type.
ndim : int, optional
Number of array dimensions.
shape : tuple of ints, optional
Array shape.
flags : str or tuple of str
Array flags; may be one or more of:
- C_CONTIGUOUS / C / CONTIGUOUS
- F_CONTIGUOUS / F / FORTRAN
- OWNDATA / O
- WRITEABLE / W
- ALIGNED / A
- WRITEBACKIFCOPY / X
- UPDATEIFCOPY / U
Returns
-------
klass : ndpointer type object
A type object, which is an ``_ndtpr`` instance containing
dtype, ndim, shape and flags information.
Raises
------
TypeError
If a given array does not satisfy the specified restrictions.
Examples
--------
>>> clib.somefunc.argtypes = [np.ctypeslib.ndpointer(dtype=np.float64,
... ndim=1,
... flags='C_CONTIGUOUS')]
... #doctest: +SKIP
>>> clib.somefunc(np.array([1, 2, 3], dtype=np.float64))
... #doctest: +SKIP
"""
# normalize dtype to an Optional[dtype]
if dtype is not None:
dtype = _dtype(dtype)
# normalize flags to an Optional[int]
num = None
if flags is not None:
if isinstance(flags, str):
flags = flags.split(',')
elif isinstance(flags, (int, integer)):
num = flags
flags = _flags_fromnum(num)
elif isinstance(flags, flagsobj):
num = flags.num
flags = _flags_fromnum(num)
if num is None:
try:
flags = [x.strip().upper() for x in flags]
except Exception:
raise TypeError("invalid flags specification")
num = _num_fromflags(flags)
# normalize shape to an Optional[tuple]
if shape is not None:
try:
shape = tuple(shape)
except TypeError:
# single integer -> 1-tuple
shape = (shape, )
cache_key = (dtype, ndim, shape, num)
try:
return _pointer_type_cache[cache_key]
except KeyError:
pass
# produce a name for the new type
if dtype is None:
name = 'any'
elif dtype.names is not None:
name = str(id(dtype))
else:
name = dtype.str
if ndim is not None:
name += "_%dd" % ndim
if shape is not None:
name += "_" + "x".join(str(x) for x in shape)
if flags is not None:
name += "_" + "_".join(flags)
if dtype is not None and shape is not None:
base = _concrete_ndptr
else:
base = _ndptr
klass = type("ndpointer_%s" % name, (base, ), {
"_dtype_": dtype,
"_shape_": shape,
"_ndim_": ndim,
"_flags_": num
})
_pointer_type_cache[cache_key] = klass
return klass
def ndpointer(dtype=None, ndim=None, shape=None, flags=None):
"""Array-checking restype/argtypes.
An ndpointer instance is used to describe an ndarray in restypes
and argtypes specifications. This approach is more flexible than
using, for example,
POINTER(c_double)
since several restrictions can be specified, which are verified
upon calling the ctypes function. These include data type
(dtype), number of dimensions (ndim), shape and flags (e.g.
'C_CONTIGUOUS' or 'F_CONTIGUOUS'). If a given array does not satisfy the
specified restrictions, a TypeError is raised.
Example:
clib.somefunc.argtypes = [ndpointer(dtype=float64,
ndim=1,
flags='C_CONTIGUOUS')]
clib.somefunc(array([1,2,3],dtype=float64))
"""
if dtype is not None:
dtype = _dtype(dtype)
num = None
if flags is not None:
if isinstance(flags, str):
flags = flags.split(',')
elif isinstance(flags, (int, integer)):
num = flags
flags = _flags_fromnum(num)
elif isinstance(flags, flagsobj):
num = flags.num
flags = _flags_fromnum(num)
if num is None:
try:
flags = [x.strip().upper() for x in flags]
except:
raise TypeError, "invalid flags specification"
num = _num_fromflags(flags)
try:
return _pointer_type_cache[(dtype, ndim, shape, num)]
except KeyError:
pass
if dtype is None:
name = 'any'
elif dtype.names:
name = str(id(dtype))
else:
name = dtype.str
if ndim is not None:
name += "_%dd" % ndim
if shape is not None:
try:
strshape = [str(x) for x in shape]
except TypeError:
strshape = [str(shape)]
shape = (shape,)
shape = tuple(shape)
name += "_"+"x".join(strshape)
if flags is not None:
name += "_"+"_".join(flags)
else:
flags = []
klass = type("ndpointer_%s"%name, (_ndptr,),
{"_dtype_": dtype,
"_shape_" : shape,
"_ndim_" : ndim,
"_flags_" : num})
_pointer_type_cache[dtype] = klass
return klass
def ndpointer(dtype=None, ndim=None, shape=None, flags=None):
"""
Array-checking restype/argtypes.
An ndpointer instance is used to describe an ndarray in restypes
and argtypes specifications. This approach is more flexible than
using, for example, ``POINTER(c_double)``, since several restrictions
can be specified, which are verified upon calling the ctypes function.
These include data type, number of dimensions, shape and flags. If a
given array does not satisfy the specified restrictions,
a ``TypeError`` is raised.
Parameters
----------
dtype : data-type, optional
Array data-type.
ndim : int, optional
Number of array dimensions.
shape : tuple of ints, optional
Array shape.
flags : string or tuple of strings
Array flags; may be one or more of:
- C_CONTIGUOUS / C / CONTIGUOUS
- F_CONTIGUOUS / F / FORTRAN
- OWNDATA / O
- WRITEABLE / W
- ALIGNED / A
- UPDATEIFCOPY / U
Examples
--------
>>> clib.somefunc.argtypes = [np.ctypeslib.ndpointer(dtype=float64,
... ndim=1,
... flags='C_CONTIGUOUS')]
>>> clib.somefunc(np.array([1, 2, 3], dtype=np.float64))
"""
if dtype is not None:
dtype = _dtype(dtype)
num = None
if flags is not None:
if isinstance(flags, str):
flags = flags.split(',')
elif isinstance(flags, (int, integer)):
num = flags
flags = _flags_fromnum(num)
elif isinstance(flags, flagsobj):
num = flags.num
flags = _flags_fromnum(num)
if num is None:
try:
flags = [x.strip().upper() for x in flags]
except:
raise TypeError, "invalid flags specification"
num = _num_fromflags(flags)
try:
return _pointer_type_cache[(dtype, ndim, shape, num)]
except KeyError:
pass
if dtype is None:
name = 'any'
elif dtype.names:
name = str(id(dtype))
else:
name = dtype.str
if ndim is not None:
name += "_%dd" % ndim
if shape is not None:
try:
strshape = [str(x) for x in shape]
except TypeError:
strshape = [str(shape)]
shape = (shape, )
shape = tuple(shape)
name += "_" + "x".join(strshape)
if flags is not None:
name += "_" + "_".join(flags)
else:
flags = []
klass = type("ndpointer_%s" % name, (_ndptr, ), {
"_dtype_": dtype,
"_shape_": shape,
"_ndim_": ndim,
"_flags_": num
})
_pointer_type_cache[dtype] = klass
return klass
