petsc-3.9.4 2018-09-11
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TSSetCostGradients

 Sets the initial value of the gradients of the cost function w.r.t. initial values and w.r.t. the problem parameters for use by the TSAdjoint routines.

Synopsis

#include "petscts.h"  
PetscErrorCode TSSetCostGradients(TS ts,PetscInt numcost,Vec *lambda,Vec *mu)
Logically Collective on TS and Vec

Input Parameters

ts - the TS context obtained from TSCreate()
lambda - gradients with respect to the initial condition variables, the dimension and parallel layout of these vectors is the same as the ODE solution vector
mu - gradients with respect to the parameters, the number of entries in these vectors is the same as the number of parameters

Notes: the entries in these vectors must be correctly initialized with the values lamda_i = df/dy|finaltime mu_i = df/dp|finaltime

After TSAdjointSolve() is called the lamba and the mu contain the computed sensitivities

Keywords

TS, timestep, set, sensitivity, initial values

Level

beginner

Location

src/ts/interface/tssen.c

Examples

src/ts/examples/tutorials/extchem.c.html
src/ts/examples/tutorials/ex16adj.c.html
src/ts/examples/tutorials/ex16opt_p.c.html
src/ts/examples/tutorials/ex16opt_ic.c.html
src/ts/examples/tutorials/ex20adj.c.html
src/ts/examples/tutorials/ex20opt_p.c.html
src/ts/examples/tutorials/ex20opt_ic.c.html
src/tao/unconstrained/examples/tutorials/spectraladjointassimilation.c.html

Index of all TS routines
Table of Contents for all manual pages
Index of all manual pages