def _assign_values(self, coords, values):
"""Assign the `values` to the positions stated in `coords`."""
for nrow, value in zip(coords, values):
if nrow >= self.nrows:
raise IndexError("First index out of range")
if nrow < 0:
# To support negative values
nrow += self.nrows
object_ = value
# Prepare the object to convert it into a NumPy object
atom = self.atom
if not hasattr(atom, 'size'): # it is a pseudo-atom
object_ = atom.toarray(object_)
statom = atom.base
else:
statom = atom
value = convertToNPAtom(object_, statom)
nobjects = self._getnobjects(value)
# Get the previous value
nrow = idx2long(nrow) # To convert any possible numpy scalar value
nparr = self._readArray(nrow, nrow + 1, 1)[0]
nobjects = len(nparr)
if len(value) > nobjects:
raise ValueError("Length of value (%s) is larger than number "
"of elements in row (%s)" %
(len(value), nobjects))
try:
nparr[:] = value
except Exception, exc: #XXX
raise ValueError(
"Value parameter:\n'%r'\n"
"cannot be converted into an array object compliant "
"vlarray[%s] row: \n'%r'\nThe error was: <%s>" %
(value, nrow, nparr[:], exc))
if nparr.size > 0:
self._modify(nrow, nparr, nobjects)
def _assign_values(self, coords, values):
"""Assign the `values` to the positions stated in `coords`."""
for nrow, value in zip(coords, values):
if nrow >= self.nrows:
raise IndexError("First index out of range")
if nrow < 0:
# To support negative values
nrow += self.nrows
object_ = value
# Prepare the object to convert it into a NumPy object
atom = self.atom
if not hasattr(atom, 'size'): # it is a pseudo-atom
object_ = atom.toarray(object_)
statom = atom.base
else:
statom = atom
value = convertToNPAtom(object_, statom)
nobjects = self._getnobjects(value)
# Get the previous value
nrow = idx2long(nrow) # To convert any possible numpy scalar value
nparr = self._readArray(nrow, nrow+1, 1)[0]
nobjects = len(nparr)
if len(value) > nobjects:
raise ValueError("Length of value (%s) is larger than number "
"of elements in row (%s)" % (len(value),
nobjects))
try:
nparr[:] = value
except Exception, exc: #XXX
raise ValueError("Value parameter:\n'%r'\n"
"cannot be converted into an array object compliant "
"vlarray[%s] row: \n'%r'\nThe error was: <%s>" %
(value, nrow, nparr[:], exc))
if nparr.size > 0:
self._modify(nrow, nparr, nobjects)
def __setitem__(self, keys, value):
"""
Set a row in the array.
It takes different actions depending on the type of the `key`
parameter: if it is an integer, the corresponding array row is
set to `value`. If `key` is a tuple, the first element refers
to the row to be modified, and the second element to the range
within the row to be updated with the `value` (so it can be an
integer or a slice).
The type and shape of the `value` must be compatible with the
type and shape determined by the `key`, otherwise, a
``TypeError`` or a ``ValueError`` will be raised.
.. Note:: When updating the rows of a `VLArray` object which
uses a pseudo-atom, there is a problem: you can only update
values with *exactly* the same size in bytes than the
original row. This is very difficult to meet with
``object`` pseudo-atoms, because ``cPickle`` applied on a
Python object does not guarantee to return the same number
of bytes than over another object, even if they are of the
same class. This effectively limits the kinds of objects
than can be updated in variable-length arrays.
Example of use::
vlarray[0] = vlarray[0] * 2 + 3
vlarray[99, 3:] = arange(96) * 2 + 3
# Negative values for start and stop (but not step) are supported.
vlarray[99, -99:-89:2] = vlarray[5] * 2 + 3
"""
self._v_file._checkWritable()
if not isinstance(keys, tuple):
keys = (keys, None)
if len(keys) > 2:
raise IndexError, "You cannot specify more than two dimensions"
nrow, rng = keys
# Process the first index
if not (type(nrow) in (int,long) or isinstance(nrow, numpy.integer)):
raise IndexError, "The first dimension only can be an integer"
if nrow >= self.nrows:
raise IndexError, "First index out of range"
if nrow < 0:
# To support negative values
nrow += self.nrows
# Process the second index
if type(rng) in (int,long) or isinstance(rng, numpy.integer):
start = rng; stop = start+1; step = 1
elif isinstance(rng, slice):
start, stop, step = rng.start, rng.stop, rng.step
elif rng is None:
start, stop, step = None, None, None
else:
raise IndexError, "Non-valid second index or slice: %s" % rng
object = value
# Prepare the object to convert it into a NumPy object
atom = self.atom
if not hasattr(atom, 'size'): # it is a pseudo-atom
object = atom.toarray(object)
statom = atom.base
else:
statom = atom
value = convertToNPAtom(object, statom)
nobjects = self._getnobjects(value)
# Get the previous value
nrow = idx2long(nrow) # To convert any possible numpy scalar value
nparr = self._readArray(nrow, nrow+1, 1)[0]
nobjects = len(nparr)
if len(value) > nobjects:
raise ValueError, \
"Length of value (%s) is larger than number of elements in row (%s)" % \
(len(value), nobjects)
# Assign the value to it
# The values can be numpy scalars. Convert them before building the slice.
if start is not None: start = idx2long(start)
if stop is not None: stop = idx2long(stop)
if step is not None: step = idx2long(step)
try:
nparr[slice(start, stop, step)] = value
except Exception, exc: #XXX
raise ValueError, \
"Value parameter:\n'%r'\ncannot be converted into an array object compliant vlarray[%s] row: \n'%r'\nThe error was: <%s>" % \
(value, keys, nparr[slice(start, stop, step)], exc)
