Exemple #1
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def zeros(dshape, params=None, eclass=_eclass.manifest):
    """ Create an Array and fill it with zeros.

    Parameters
    ----------
    dshape : str, blaze.dshape instance
        Specifies the datashape of the outcome object.
    params : blaze.params object
        Any parameter supported by the backend library.

    Returns
    -------
    out : an Array object.

    """
    if isinstance(dshape, basestring):
        dshape = _dshape(dshape)
    shape, dtype = to_numpy(dshape)
    cparams, rootdir, format_flavor = to_cparams(params or _params())
    if rootdir is not None:
        carray.zeros(shape, dtype, rootdir=rootdir, cparams=cparams)
        return open(rootdir)
    else:
        source = CArraySource(carray.zeros(shape, dtype, cparams=cparams),
                              params=params)
        if eclass is _eclass.manifest:
            return Array(source)
        elif eclass is _eclass.delayed:
            return NDArray(source)
Exemple #2
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def zeros(dshape, params=None):
    """ Create an Array and fill it with zeros.

    Parameters
    ----------
    dshape : str, blaze.dshape instance
        Specifies the datashape of the outcome object.
    params : blaze.params object
        Any parameter supported by the backend library.

    Returns
    -------
    out : an Array object.

    """
    if isinstance(dshape, basestring):
        dshape = _dshape(dshape)
    shape, dtype = to_numpy(dshape)
    cparams, rootdir, format_flavor = to_cparams(params or _params())
    if rootdir is not None:
        carray.zeros(shape, dtype, rootdir=rootdir, cparams=cparams)
        return open(rootdir)
    else:
        source = CArraySource(carray.zeros(shape, dtype, cparams=cparams),
                              params=params)
        return Array(source)
Exemple #3
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def fromiter(iterable, dshape, params=None):
    """ Create an Array and fill it with values from `iterable`.

    Parameters
    ----------
    iterable : iterable object
        An iterable object providing data for the carray.
    dshape : str, blaze.dshape instance
        Specifies the datashape of the outcome object.  Only 1d shapes
        are supported right now. When the `iterator` should return an
        unknown number of items, a ``TypeVar`` can be used.
    params : blaze.params object
        Any parameter supported by the backend library.

    Returns
    -------
    out : an Array object.

    """
    if isinstance(dshape, basestring):
        dshape = _dshape(dshape)
    shape, dtype = dshape.parameters[:-1], dshape.parameters[-1]
    # Check the shape part
    if len(shape) > 1:
        raise ValueError("shape can be only 1-dimensional")
    length = shape[0]
    count = -1
    if type(length) == TypeVar:
        count = -1
    elif type(length) == Fixed:
        count = length.val

    dtype = dtype.to_dtype()
    # Now, create the Array itself (using the carray backend)
    cparams, rootdir, format_flavor = to_cparams(params or _params())
    if rootdir is not None:
        carray.fromiter(iterable,
                        dtype,
                        count=count,
                        rootdir=rootdir,
                        cparams=cparams)
        return open(rootdir)
    else:
        ica = carray.fromiter(iterable, dtype, count=count, cparams=cparams)
        source = CArraySource(ica, params=params)
        return Array(source)
Exemple #4
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def fromiter(iterable, dshape, params=None):
    """ Create an Array and fill it with values from `iterable`.

    Parameters
    ----------
    iterable : iterable object
        An iterable object providing data for the carray.
    dshape : str, blaze.dshape instance
        Specifies the datashape of the outcome object.  Only 1d shapes
        are supported right now. When the `iterator` should return an
        unknown number of items, a ``TypeVar`` can be used.
    params : blaze.params object
        Any parameter supported by the backend library.

    Returns
    -------
    out : an Array object.

    """
    if isinstance(dshape, basestring):
        dshape = _dshape(dshape)
    shape, dtype = dshape.parameters[:-1], dshape.parameters[-1]
    # Check the shape part
    if len(shape) > 1:
        raise ValueError("shape can be only 1-dimensional")
    length = shape[0]
    count = -1
    if type(length) == TypeVar:
        count = -1
    elif type(length) == Fixed:
        count = length.val

    dtype = dtype.to_dtype()
    # Now, create the Array itself (using the carray backend)
    cparams, rootdir, format_flavor = to_cparams(params or _params())
    if rootdir is not None:
        carray.fromiter(iterable, dtype, count=count,
                        rootdir=rootdir, cparams=cparams)
        return open(rootdir)
    else:
        ica = carray.fromiter(iterable, dtype, count=count, cparams=cparams)
        source = CArraySource(ica, params=params)
        return Array(source)