Base class for bivariate splines.
This describes a spline s(x, y) of degrees kx and ky on the rectangle [xb, xe] * [yb, ye] calculated from a given set of data points (x, y, z).
|__call__(x, y[, mth])||Evaluate spline at the grid points defined by the coordinate arrays|
|ev(xi, yi)||Evaluate spline at points (x[i], y[i]), i=0,...,len(x)-1|
|get_coeffs()||Return spline coefficients.|
|get_knots()||Return a tuple (tx,ty) where tx,ty contain knots positions of the spline with respect to x-, y-variable, respectively.|
|get_residual()||Return weighted sum of squared residuals of the spline|
|integral(xa, xb, ya, yb)||Evaluate the integral of the spline over area [xa,xb] x [ya,yb].|