numpy.polynomial.polynomial.polyval2d()

numpy.polynomial.polynomial.polyval2d(x, y, c) [source]

Evaluate a 2-D polynomial at points (x, y).

This function returns the value

$p(x,y) = \sum_{i,j} c_{i,j} * x^i * y^j$

The parameters x and y are converted to arrays only if they are tuples or a lists, otherwise they are treated as a scalars and they must have the same shape after conversion. In either case, either x and y or their elements must support multiplication and addition both with themselves and with the elements of c.

If c has fewer than two dimensions, ones are implicitly appended to its shape to make it 2-D. The shape of the result will be c.shape[2:] + x.shape.

Parameters:

Parameters:	x, y : array_like, compatible objects The two dimensional series is evaluated at the points `(x, y)`, where `x` and `y` must have the same shape. If `x` or `y` is a list or tuple, it is first converted to an ndarray, otherwise it is left unchanged and, if it isn?t an ndarray, it is treated as a scalar. c : array_like Array of coefficients ordered so that the coefficient of the term of multi-degree i,j is contained in `c[i,j]`. If `c` has dimension greater than two the remaining indices enumerate multiple sets of coefficients.
Returns:	values : ndarray, compatible object The values of the two dimensional polynomial at points formed with pairs of corresponding values from `x` and `y`.

x, y : array_like, compatible objects

The two dimensional series is evaluated at the points (x, y), where x and y must have the same shape. If x or y is a list or tuple, it is first converted to an ndarray, otherwise it is left unchanged and, if it isn?t an ndarray, it is treated as a scalar.

c : array_like

Array of coefficients ordered so that the coefficient of the term of multi-degree i,j is contained in c[i,j]. If c has dimension greater than two the remaining indices enumerate multiple sets of coefficients.

Returns:

values : ndarray, compatible object

The values of the two dimensional polynomial at points formed with pairs of corresponding values from x and y.

Notes

New in version 1.7.0.

Links:

https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.polynomial.polynomial.polyval2d.html

doc_NumPy

2017-01-10 18:17:49

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