[gradsusr] Max field over multiple files

[Tracey Dorian]

Good morning,

Does anybody know if there is a way in GrADS to find the max or min value
over multiple control files?  For example, if I wanted to find the maximum
temperature between file1.ctl, file2.ctl, file3.ctl, and file4.ctl?

I imagine it would be something like this, but I don't think GrADS supports
this:

d max(temp, file1.ctl, file2.ctl, file3.ctl, file4.ctl)

Thanks in advance for any assistance,
Tracey
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