Hi,

I am trying to find a lambda by the linesearch such that

f([x_{k}+\lambda d_{k}])<f(x_{k})+\alpha\lambda grad f(x_{k})^{T}d_{k}

where [x_{k}+lambda d_{k}] means the projection that cuts off the undershoot or overshoot of  x_{k}+lambda d_{k}.

How to add the above projection into the linesearch in PETSc?

Thanks!