LabVIEW
Input "X" of Constrained Nonlinear Curve Fit.vi should be mandatory
as the title says, the VI appears to have a necessary input which can currently be left unwired (and result in a failed fit):
Tested in LV 2015 SP1 64 bit
as the title says, the VI appears to have a necessary input which can currently be left unwired (and result in a failed fit):
Tested in LV 2015 SP1 64 bit