This class defines bivariate functions that can be expressed by two sets of basis functions and the associated coefficient matrix. It takes the following form:
K(s, t) = sum_{i,j} a_{ij} * f_i(s) * g_j(t)
Here K(s, t) is the bivariate function, f_i and g_j are two basis systems, and A = (a_{ij}) is the coefficient matrix.
sbasis,tbasis
Basis objects of class basis+
,
not necessarily of the same type (for example, one can be
bspline+
and the other be
fourier+
).
coefs
A matrix of dimension m
by n
where m
is the number of functions in sbasis
, and n
is the number of functions in tbasis
.
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