[gradsusr] error in if command of grads

[chinh ta huu]

Dear Sir/Madam
    I use if command for calculating but I had a problem as below
This is my module:

       function main(args)
            year=subwrd(args,1)
            para=1
            *if (para = 1)
*                'sdfopen
/home/chinhth/DATA/HINCAST/COLA/z500/COLA/JUN/'year'/z500.nc'
                'set t 1'
                'set z 1'
                'set lat -90 90'
                'set lon 0 357.5'
                'set gxout print'
                'set prnopts %g 1 1'
                'd z500'
                res=result

w=write('/home/chinhth/DATA/HINCAST/COLA/z500/COLA/JUN/'year'/'year'.txt',res)
            *endif
*But I don't understand one error occur as bellow:
           *Unable to locate ENDIF statement for the IF statement at line 8
            In file convert_txt.gs*
Please tell me this problem
Thank you
Chinh

-- 
(Mr.) Ta Huu Chinh
National, Weather Forecasting Center, Ha Noi, Viet Nam.
No: 4th, Dang Thai Than, Hoan Kiem, Ha Noi
Tel: 84-903-402-181
Fax: 84-43-824-4917
Email: chinhth2010 at gmail.com
Website: http://vn.myblog.yahoo.com/chinhth2005/
Website: http://bestknowledge-chinhth.blogspot.com/
Website: http://anhcuoidep.vn
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