It looks like the system is expecting the ": operator" That is a colon, AFTER the File Name and BEFORE the = sign
Cheers,
Reinaldo
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Joelle Dagnelies escreveu:
Dear list members,
I have a polygon map showing the borders of 82 fields : parcellesnr. I want to extract from a radar map the values located in these fields . For this, I rasterized the parcellesnr map (id domain changed to value domain) and I tried the following statement (based on the message "study area" from march 12, 2003 on the list)
sigma_parcelles = IFF(parcellesnr, 14oct02cal, ?)
I receive an error message :'operator' expected, Ilwis error 4020
Can somebody tell me what is wrong ? I tried to change the domain of parcellesnr from ID to value, changed the statement, ...always receiving an error message (sometimes invalid 'operand')
Another question : once I have the 82 fields with their radar values, how can I calculate, easily, the mean values for each field ?
Thank you,
Joelle
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