Python ma.getmaskarray方法代碼示例

# 需要導入模塊: from numpy import ma [as 別名]
# 或者: from numpy.ma import getmaskarray [as 別名]
def __call__(self, x, clip=None):
        if clip is None:
            clip = self.clip
        x = ma.asarray(x)
        mask = ma.getmaskarray(x)
        xx = x.filled(self.vmax + 1)
        if clip:
            np.clip(xx, self.vmin, self.vmax)
        iret = np.zeros(x.shape, dtype=np.int16)
        for i, b in enumerate(self.boundaries):
            iret[xx >= b] = i
        if self._interp:
            scalefac = float(self.Ncmap - 1) / (self.N - 2)
            iret = (iret * scalefac).astype(np.int16)
        iret[xx < self.vmin] = -1
        iret[xx >= self.vmax] = self.Ncmap
        ret = ma.array(iret, mask=mask)
        if ret.shape == () and not mask:
            ret = int(ret)  # assume python scalar
        return ret 

# 需要導入模塊: from numpy import ma [as 別名]
# 或者: from numpy.ma import getmaskarray [as 別名]
def calculate_marginals_on_samples(self, theta, Xm, return_ratio=True):
        """Calculate the value of the marginal distribution for each variable, for each hidden variable and each sample.

        theta: array parametrizing the marginals
        Xm: the data
        returns log p(y_j|x_i)/p(y_j) for each j,sample,i,y_j. [n_hidden, n_samples, n_visible, dim_hidden]
        """
        n_samples = Xm.shape[0]
        log_marg_x = np.zeros((self.n_hidden, n_samples, self.n_visible, self.dim_hidden))
        for i in range(self.n_visible):
            not_missing = np.logical_not(ma.getmaskarray(Xm)[:, i])
            log_marg_x[:, not_missing, i, :] = self.marginal_p(Xm[not_missing,i], theta[i, :, :, :])
        if return_ratio:
            # Again, I use the same p(y) here for each x_i, but for missing variables, p(y) on obs. sample may be different.
            log_p_xi = logsumexp(log_marg_x + self.log_p_y.reshape((self.n_hidden, 1, 1, self.dim_hidden)), axis=3)
            log_marg_x -= log_p_xi[:, :, :, np.newaxis]
        return log_marg_x 

# 需要導入模塊: from numpy import ma [as 別名]
# 或者: from numpy.ma import getmaskarray [as 別名]
def __setitem__(self, indx, value):
        """
        Sets the given record to value.

        """
        MaskedArray.__setitem__(self, indx, value)
        if isinstance(indx, basestring):
            self._mask[indx] = ma.getmaskarray(value) 

# 需要導入模塊: from numpy import ma [as 別名]
# 或者: from numpy.ma import getmaskarray [as 別名]
def fromarrays(arraylist, dtype=None, shape=None, formats=None,
               names=None, titles=None, aligned=False, byteorder=None,
               fill_value=None):
    """
    Creates a mrecarray from a (flat) list of masked arrays.

    Parameters
    ----------
    arraylist : sequence
        A list of (masked) arrays. Each element of the sequence is first converted
        to a masked array if needed. If a 2D array is passed as argument, it is
        processed line by line
    dtype : {None, dtype}, optional
        Data type descriptor.
    shape : {None, integer}, optional
        Number of records. If None, shape is defined from the shape of the
        first array in the list.
    formats : {None, sequence}, optional
        Sequence of formats for each individual field. If None, the formats will
        be autodetected by inspecting the fields and selecting the highest dtype
        possible.
    names : {None, sequence}, optional
        Sequence of the names of each field.
    fill_value : {None, sequence}, optional
        Sequence of data to be used as filling values.

    Notes
    -----
    Lists of tuples should be preferred over lists of lists for faster processing.

    """
    datalist = [getdata(x) for x in arraylist]
    masklist = [np.atleast_1d(getmaskarray(x)) for x in arraylist]
    _array = recfromarrays(datalist,
                           dtype=dtype, shape=shape, formats=formats,
                           names=names, titles=titles, aligned=aligned,
                           byteorder=byteorder).view(mrecarray)
    _array._mask.flat = list(zip(*masklist))
    if fill_value is not None:
        _array.fill_value = fill_value
    return _array 

# 需要導入模塊: from numpy import ma [as 別名]
# 或者: from numpy.ma import getmaskarray [as 別名]
def addfield(mrecord, newfield, newfieldname=None):
    """Adds a new field to the masked record array

    Uses `newfield` as data and `newfieldname` as name. If `newfieldname`
    is None, the new field name is set to 'fi', where `i` is the number of
    existing fields.

    """
    _data = mrecord._data
    _mask = mrecord._mask
    if newfieldname is None or newfieldname in reserved_fields:
        newfieldname = 'f%i' % len(_data.dtype)
    newfield = ma.array(newfield)
    # Get the new data.
    # Create a new empty recarray
    newdtype = np.dtype(_data.dtype.descr + [(newfieldname, newfield.dtype)])
    newdata = recarray(_data.shape, newdtype)
    # Add the existing field
    [newdata.setfield(_data.getfield(*f), *f)
         for f in _data.dtype.fields.values()]
    # Add the new field
    newdata.setfield(newfield._data, *newdata.dtype.fields[newfieldname])
    newdata = newdata.view(MaskedRecords)
    # Get the new mask
    # Create a new empty recarray
    newmdtype = np.dtype([(n, bool_) for n in newdtype.names])
    newmask = recarray(_data.shape, newmdtype)
    # Add the old masks
    [newmask.setfield(_mask.getfield(*f), *f)
         for f in _mask.dtype.fields.values()]
    # Add the mask of the new field
    newmask.setfield(getmaskarray(newfield),
                     *newmask.dtype.fields[newfieldname])
    newdata._mask = newmask
    return newdata 

# 需要導入模塊: from numpy import ma [as 別名]
# 或者: from numpy.ma import getmaskarray [as 別名]
def masked_rec_array_to_mgr(data, index, columns, dtype, copy):
    """
    Extract from a masked rec array and create the manager.
    """

    # essentially process a record array then fill it
    fill_value = data.fill_value
    fdata = ma.getdata(data)
    if index is None:
        index = get_names_from_index(fdata)
        if index is None:
            index = ibase.default_index(len(data))
    index = ensure_index(index)

    if columns is not None:
        columns = ensure_index(columns)
    arrays, arr_columns = to_arrays(fdata, columns)

    # fill if needed
    new_arrays = []
    for fv, arr, col in zip(fill_value, arrays, arr_columns):
        mask = ma.getmaskarray(data[col])
        if mask.any():
            arr, fv = maybe_upcast(arr, fill_value=fv, copy=True)
            arr[mask] = fv
        new_arrays.append(arr)

    # create the manager
    arrays, arr_columns = reorder_arrays(new_arrays, arr_columns, columns)
    if columns is None:
        columns = arr_columns

    mgr = arrays_to_mgr(arrays, arr_columns, index, columns, dtype)

    if copy:
        mgr = mgr.copy()
    return mgr


# ---------------------------------------------------------------------
# DataFrame Constructor Interface 

# 需要導入模塊: from numpy import ma [as 別名]
# 或者: from numpy.ma import getmaskarray [as 別名]
def __init__(self,vals,vals_dmin,vals_dmax,mask=ma.nomask):
        super(UncertContainer, self).__init__()
        
        # If input data already masked arrays extract unmasked data
        if ma.isMaskedArray(vals): 
            vals = vals.data
        if ma.isMaskedArray(vals_dmin):
            vals_dmin = vals_dmin.data
        if ma.isMaskedArray(vals_dmax):
            vals_dmax = vals_dmax.data
        
        # Adjust negative values
        ineg = np.where(vals_dmin <= 0.0)
        vals_dmin[ineg] = TOL*vals[ineg]

        # Calculate weight based on fractional uncertainty 
        diff = vals_dmax - vals_dmin
        diff_m = ma.masked_where(vals_dmax == vals_dmin,diff)        

        self.vals = ma.masked_where(vals == 0.0,vals)

        self.wt = (self.vals/diff_m)**2
        self.uncert = diff_m/self.vals

        self.wt.fill_value = np.inf
        self.uncert.fill_vaule = np.inf

        assert np.all(self.wt.mask == self.uncert.mask)
        
        # Mask data if uncertainty is not finite or if any of the inputs were
        # already masked

        mm = ma.mask_or(self.wt.mask,mask)
        
        self.vals.mask = mm
        self.wt.mask = mm
        self.uncert.mask = mm
        self.dmin = ma.array(vals_dmin,mask=mm,fill_value=np.inf)
        self.dmax = ma.array(vals_dmax,mask=mm,fill_value=np.inf)

        self.mask = ma.getmaskarray(self.vals) 

# 需要導入模塊: from numpy import ma [as 別名]
# 或者: from numpy.ma import getmaskarray [as 別名]
def test_set_mask(self):
        base = self.base.copy()
        mbase = base.view(mrecarray)
        # Set the mask to True .......................
        mbase.mask = masked
        assert_equal(ma.getmaskarray(mbase['b']), [1]*5)
        assert_equal(mbase['a']._mask, mbase['b']._mask)
        assert_equal(mbase['a']._mask, mbase['c']._mask)
        assert_equal(mbase._mask.tolist(),
                     np.array([(1, 1, 1)]*5, dtype=bool))
        # Delete the mask ............................
        mbase.mask = nomask
        assert_equal(ma.getmaskarray(mbase['c']), [0]*5)
        assert_equal(mbase._mask.tolist(),
                     np.array([(0, 0, 0)]*5, dtype=bool)) 

# 需要導入模塊: from numpy import ma [as 別名]
# 或者: from numpy.ma import getmaskarray [as 別名]
def addfield(mrecord, newfield, newfieldname=None):
    """Adds a new field to the masked record array

    Uses `newfield` as data and `newfieldname` as name. If `newfieldname`
    is None, the new field name is set to 'fi', where `i` is the number of
    existing fields.

    """
    _data = mrecord._data
    _mask = mrecord._mask
    if newfieldname is None or newfieldname in reserved_fields:
        newfieldname = 'f%i' % len(_data.dtype)
    newfield = ma.array(newfield)
    # Get the new data.
    # Create a new empty recarray
    newdtype = np.dtype(_data.dtype.descr + [(newfieldname, newfield.dtype)])
    newdata = recarray(_data.shape, newdtype)
    # Add the exisintg field
    [newdata.setfield(_data.getfield(*f), *f)
         for f in _data.dtype.fields.values()]
    # Add the new field
    newdata.setfield(newfield._data, *newdata.dtype.fields[newfieldname])
    newdata = newdata.view(MaskedRecords)
    # Get the new mask
    # Create a new empty recarray
    newmdtype = np.dtype([(n, bool_) for n in newdtype.names])
    newmask = recarray(_data.shape, newmdtype)
    # Add the old masks
    [newmask.setfield(_mask.getfield(*f), *f)
         for f in _mask.dtype.fields.values()]
    # Add the mask of the new field
    newmask.setfield(getmaskarray(newfield),
                     *newmask.dtype.fields[newfieldname])
    newdata._mask = newmask
    return newdata 

# 需要導入模塊: from numpy import ma [as 別名]
# 或者: from numpy.ma import getmaskarray [as 別名]
def __setitem__(self, indx, value):
        "Sets the given record to value."
        MaskedArray.__setitem__(self, indx, value)
        if isinstance(indx, basestring):
            self._mask[indx] = ma.getmaskarray(value) 

# 需要導入模塊: from numpy import ma [as 別名]
# 或者: from numpy.ma import getmaskarray [as 別名]
def addfield(mrecord, newfield, newfieldname=None):
    """Adds a new field to the masked record array, using `newfield` as data
and `newfieldname` as name. If `newfieldname` is None, the new field name is
set to 'fi', where `i` is the number of existing fields.
    """
    _data = mrecord._data
    _mask = mrecord._mask
    if newfieldname is None or newfieldname in reserved_fields:
        newfieldname = 'f%i' % len(_data.dtype)
    newfield = ma.array(newfield)
    # Get the new data ............
    # Create a new empty recarray
    newdtype = np.dtype(_data.dtype.descr + [(newfieldname, newfield.dtype)])
    newdata = recarray(_data.shape, newdtype)
    # Add the exisintg field
    [newdata.setfield(_data.getfield(*f), *f)
         for f in _data.dtype.fields.values()]
    # Add the new field
    newdata.setfield(newfield._data, *newdata.dtype.fields[newfieldname])
    newdata = newdata.view(MaskedRecords)
    # Get the new mask .............
    # Create a new empty recarray
    newmdtype = np.dtype([(n, bool_) for n in newdtype.names])
    newmask = recarray(_data.shape, newmdtype)
    # Add the old masks
    [newmask.setfield(_mask.getfield(*f), *f)
         for f in _mask.dtype.fields.values()]
    # Add the mask of the new field
    newmask.setfield(getmaskarray(newfield),
                     *newmask.dtype.fields[newfieldname])
    newdata._mask = newmask
    return newdata 

# 需要導入模塊: from numpy import ma [as 別名]
# 或者: from numpy.ma import getmaskarray [as 別名]
def _masked_rec_array_to_mgr(data, index, columns, dtype, copy):
    """ extract from a masked rec array and create the manager """

    # essentially process a record array then fill it
    fill_value = data.fill_value
    fdata = ma.getdata(data)
    if index is None:
        index = _get_names_from_index(fdata)
        if index is None:
            index = _default_index(len(data))
    index = _ensure_index(index)

    if columns is not None:
        columns = _ensure_index(columns)
    arrays, arr_columns = _to_arrays(fdata, columns)

    # fill if needed
    new_arrays = []
    for fv, arr, col in zip(fill_value, arrays, arr_columns):
        mask = ma.getmaskarray(data[col])
        if mask.any():
            arr, fv = _maybe_upcast(arr, fill_value=fv, copy=True)
            arr[mask] = fv
        new_arrays.append(arr)

    # create the manager
    arrays, arr_columns = _reorder_arrays(new_arrays, arr_columns, columns)
    if columns is None:
        columns = arr_columns

    mgr = _arrays_to_mgr(arrays, arr_columns, index, columns)

    if copy:
        mgr = mgr.copy()
    return mgr