Check the existence of coordinate variable for a dimension in a variable

I would like to know about a way to check the existence of coordinate
variable for a dimension in a variable.

I tried this way.

..............................
.............................
if(.not.isdefined(data&time))
    print("Enter the file-variable representing time : ")
    data&time = file1[:]->$systemfunc("read var; echo $var")$
end if
............................
.........................
My plan is to assign coordinate variable only if it is not already
assigned.
But it end up with an error message :

fatal:No coordinate variable exists for dimension (time) in variable (data)

Error is pointed at :

     *if(.not.isdefined(data&time))*

The script is working if I remove the conditional statement.

How can I do it in a better way ?

-- 
*Gibies George,   CSIR-RF,
Climate and Global Modelling Division,
Indian Institute of Tropical Meteorology,
Dr. Homi Bhabha Road,
NCL (P. O.), Pashan,
Pune 411008, India.*
*http://sites.google.com/site/gibiesge/*
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Received on Mon Feb 7 02:50:43 2011