[ferret_users] check if a particular file exists

[David Wang <climater@xxxxxxxxx>]

Hello Ferreters,

I'd like to make a conditional construct so that if a particular netcdf file exists in the local directory, open it, if not, do something else. this is quite trivial in MATLAB using exist function, but seems nontrivial for me in FERRET. Does anyone have any ideas?

Thanks,
David