CppAD: A C++ Algorithmic Differentiation Package
20130918
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void CppAD::reverse_csum_op | ( | size_t | d, |
size_t | i_z, | ||
const addr_t * | arg, | ||
size_t | nc_partial, | ||
Base * | partial | ||
) | [inline] |
Compute reverse mode Taylor coefficients for result of op = CsumOp.
This operation is
z = q + x(1) + ... + x(m) - y(1) - ... - y(n). H(y, x, w, ...) = G[ z(x, y), y, x, w, ... ]
Base | base type for the operator; i.e., this operation was recorded using AD< Base > and computations by this routine are done using type Base. |
d | order the highest order Taylor coefficient that we are computing the partial derivatives with respect to. |
i_z | variable index corresponding to the result for this operation; i.e. the row index in taylor corresponding to z. |
arg | arg[0] is the number of addition variables in this cummulative summation; i.e., m . arg[1] is the number of subtraction variables in this cummulative summation; i.e., m . parameter[ arg[2] ] is the parameter value q in this cummunative summation. arg[2+i] for i = 1 , ... , m is the value x(i) . arg[2+arg[0]+i] for i = 1 , ... , n is the value y(i) . |
nc_partial | number of colums in the matrix containing all the partial derivatives. |
partial | Input: partial [ arg[2+i] * nc_partial + k ] for i = 1 , ... , m and k = 0 , ... , d is the partial derivative of G(z, y, x, w, ...) with respect to the k-th order Taylor coefficient corresponding to x(i) Input: partial [ arg[2+m+i] * nc_partial + k ] for i = 1 , ... , n and k = 0 , ... , d is the partial derivative of G(z, y, x, w, ...) with respect to the k-th order Taylor coefficient corresponding to y(i) Input: partial [ i_z * nc_partial + k ] for i = 1 , ... , n and k = 0 , ... , d is the partial derivative of G(z, y, x, w, ...) with respect to the k-th order Taylor coefficient corresponding to z . Output: partial [ arg[2+i] * nc_partial + k ] for i = 1 , ... , m and k = 0 , ... , d is the partial derivative of H(y, x, w, ...) with respect to the k-th order Taylor coefficient corresponding to x(i) Output: partial [ arg[2+m+i] * nc_partial + k ] for i = 1 , ... , n and k = 0 , ... , d is the partial derivative of H(y, x, w, ...) with respect to the k-th order Taylor coefficient corresponding to y(i) |
Definition at line 213 of file csum_op.hpp.
Referenced by ReverseSweep().