NAME

helderiv - helix derivative filter


SYNOPSIS

Initializer: call helderiv_init(n1,na)

Operator : ierr=helderiv_lop(adj,add,pp,qq)

Close : call helderiv_close()


PARAMETERS

n1 - int
       number of samples in n1
na - int
       number of coefs for filter
adj - logcal
      wheter or not run the adjoint
add - logical
       whether or not to add outout to data
pp - real(:)
      model
qq - real(:)
      data


DESCRIPTION

 Create and apply a helix derivative filter


SEE ALSO

the lapfac manpage, the helicon manpage


LIBRARY

geef90