petsc-master 2016-10-26
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#include "petscvec.h"  
PetscErrorCode VecStepBoundInfo(Vec X, Vec DX, Vec XL, Vec XU, PetscReal *boundmin, PetscReal *wolfemin, PetscReal *boundmax)
Collective on Vec

Input Parameters

X - vector with no negative entries
XL - lower bounds
XU - upper bounds
DX - step direction, can have negative, positive or zero entries

Output Parameter

boundmin - (may be NULL this it is not computed) maximum value so that XL[i] <= X[i] + boundmax*DX[i] <= XU[i]
wolfemin - (may be NULL this it is not computed)
boundmax - (may be NULL this it is not computed) minimum value so that X[i] + boundmax*DX[i] <= XL[i] or XU[i] <= X[i] + boundmax*DX[i]

Notes: For complex numbers only compares the real part

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