[gradsusr] Maximum with levels

[lpasmanoranjan]

Dear Users,
I am having problem in finding maximum at a grid point in the vertical
column.

I have a data set with levels as 10.1 10.2 10.3 ..... 15.0

I would like to use max function to find the maximum at a grid point in the
vertical column, something like

max(expr,lev=10.1,lev=15.0)

my script:
open ifile.ctl
set t 1
set x 1
set y 1
d max(expr,lev=10.1,lev=15.0)

The above gives Syntax Error:  Invalid dimension expression

I appreciate for any kind of help or suggestion in this regard.
-- 
Kind Regards,
Mano
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