[gradsusr] print amax value

[wendi harjupa]

Dear Sir/Madam

I need a help.

I have tried to check maximum temperature value in given grid (lon, lat)

I have tried to make GS file, as below :

'sdfopen /data'
'd amax (tbb, lon=134.9000, lon=135.4000, lat=34.50000, lat=35.0000)'
'fprintf amax'


But, I got message 'unknown command'

Any command and solution would be very appreciate

Best regards,
wendi
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