def evaluate(self, coeffs, bvec):
ppkernel = self.kernel.postprocess_at_target(
self.kernel.get_expression(bvec), bvec)
from sumpy.tools import mi_derivative
result = sum(
coeff * mi_derivative(ppkernel, bvec, mi)
for coeff, mi in zip(coeffs, self.get_coefficient_identifiers()))
return result
def translate_from(self, src_expansion, src_coeff_exprs, dvec):
logger.info(
"building translation operator: %s(%d) -> %s(%d): start"
% (type(src_expansion).__name__, src_expansion.order, type(self).__name__, self.order)
)
from sumpy.tools import mi_derivative
expr = src_expansion.evaluate(src_coeff_exprs, dvec)
result = [mi_derivative(expr, dvec, mi) for mi in self.get_coefficient_identifiers()]
logger.info("building translation operator: done")
return result
def coefficients_from_source(self, avec, bvec):
from sumpy.tools import mi_derivative
ppkernel = self.kernel.postprocess_at_source(self.kernel.get_expression(avec), avec)
return [mi_derivative(ppkernel, avec, mi) for mi in self.get_coefficient_identifiers()]
