in PyQGis i want to use saga:catchmentareaparallel algorithme, in the parametres there is an optionnel arguments , and i don't want to use theme , what is the value should i put on the argument?? i try to put null and "" but unfortuntly not working . please help
processing.runalg('saga:catchmentareaparallel', elevation, sinkroute, weight, material, target, step, method, dolinear, linearthrs, linearthrs_grid, chdir_grid, convergence, carea, cheight, cslope, accu_tot, accu_left, accu_right, caspect, flwpath)
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processing.runalg('saga:catchmentareaparallel', elevation, sinkroute, weight, material, target, step, method, dolinear, linearthrs, linearthrs_grid, chdir_grid, convergence, carea, cheight, cslope, accu_tot, accu_left, accu_right, caspect, flwpath)
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