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How to make ferret handle a variable number of arguments?



Dear Ferret users
I'm building a web site for mooring data where the user can select a variable number of sensors ( up to 10 )
and draw the plots for each sensor in one picture. Ferret is the backend application for my site.
I'm wondering how to make ferret process a variable number of arguments? This is essential to
me since the user can select different number of sensors.
I'm gonna try it in this way before I find a better solution. As the maximum number of sensors is 10, so I can fix the number of sensors passed to ferret to be a constant number 10. I will pass the selected sensor names and missing values for the rest to the ferret script. For examples, if the user selected " salinity" and "temperature", I will pass them and 8 missing values. Then the ferret script can check the arguments and plot accordingly.
I'm wondering whether it is possible to pass the actual selected number of sensors plus the sensor names to ferret, then the ferret script can check the first arguement, i.e. the actual selected number, and accordingly plot the sensors. For example, if the user selected " salinity" and "temperature", I will pass "2", "salinity" and "temperature" instead of 10 sensor names.
I'm looking forward to any suggestion.
Thanks a lot, Ding



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