[gradsusr] Get minimum and maximum value from a Time-Longitude plot

[Lyndon Mark Olaguera]

Dear all,

Is there an easy way to estimate the minimum value and maximum value from a
time-longitude plot (minimum and maximum value per longitude and time).
I am using grads 2.1.0.oga.1. I tried to use the amin() function but in the
grads window, it gives an error: unknown command amin().

Many thanks,

*Lyndz*
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