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# numpy.polynomial.laguerre.lagvander2d

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```Pseudo-Vandermonde matrix of given degrees.

Returns the pseudo-Vandermonde matrix of degrees `deg` and sample
points `(x, y)`. The pseudo-Vandermonde matrix is defined by

.. math:: V[..., deg[1]*i + j] = L_i(x) * L_j(y),

where `0 <= i <= deg[0]` and `0 <= j <= deg[1]`. The leading indices of
`V` index the points `(x, y)` and the last index encodes the degrees of
the Laguerre polynomials.(more...)
```

```        def lagvander2d(x, y, deg) :
"""Pseudo-Vandermonde matrix of given degrees.

Returns the pseudo-Vandermonde matrix of degrees `deg` and sample
points `(x, y)`. The pseudo-Vandermonde matrix is defined by

.. math:: V[..., deg[1]*i + j] = L_i(x) * L_j(y),

where `0 <= i <= deg[0]` and `0 <= j <= deg[1]`. The leading indices of
`V` index the points `(x, y)` and the last index encodes the degrees of
the Laguerre polynomials.

If ``V = lagvander2d(x, y, [xdeg, ydeg])``, then the columns of `V`
correspond to the elements of a 2-D coefficient array `c` of shape
(xdeg + 1, ydeg + 1) in the order

.. math:: c_{00}, c_{01}, c_{02} ... , c_{10}, c_{11}, c_{12} ...

and ``np.dot(V, c.flat)`` and ``lagval2d(x, y, c)`` will be the same
up to roundoff. This equivalence is useful both for least squares
fitting and for the evaluation of a large number of 2-D Laguerre
series of the same degrees and sample points.

Parameters
----------
x, y : array_like
Arrays of point coordinates, all of the same shape. The dtypes
will be converted to either float64 or complex128 depending on
whether any of the elements are complex. Scalars are converted to
1-D arrays.
deg : list of ints
List of maximum degrees of the form [x_deg, y_deg].

Returns
-------
vander2d : ndarray
The shape of the returned matrix is ``x.shape + (order,)``, where
:math:`order = (deg[0]+1)*(deg([1]+1)`.  The dtype will be the same
as the converted `x` and `y`.

--------
lagvander, lagvander3d. lagval2d, lagval3d

Notes
-----

"""
ideg = [int(d) for d in deg]
is_valid = [id == d and id >= 0 for id, d in zip(ideg, deg)]
if is_valid != [1, 1]:
raise ValueError("degrees must be non-negative integers")
degx, degy = ideg
x, y = np.array((x, y), copy=0) + 0.0

vx = lagvander(x, degx)
vy = lagvander(y, degy)
v = vx[..., None]*vy[..., None,:]
return v.reshape(v.shape[:-2] + (-1,))
```

```    def test_lagvander2d(self) :
# also tests lagval2d for non-square coefficient array
x1, x2, x3 = self.x
c = np.random.random((2, 3))
van = lag.lagvander2d(x1, x2, [1, 2])
```
```
# check shape
van = lag.lagvander2d([x1], [x2], [1, 2])
assert_(van.shape == (1, 5, 6))

```

```    def test_lagvander2d(self) :
# also tests lagval2d for non-square coefficient array
x1, x2, x3 = self.x
c = np.random.random((2, 3))
van = lag.lagvander2d(x1, x2, [1, 2])
```
```
# check shape
van = lag.lagvander2d([x1], [x2], [1, 2])
assert_(van.shape == (1, 5, 6))

```