Dear Joelle, Please change your mapname 14oct02cal to oct14_02cal or something that start from alphabets. Ilwis tends to confuse with map name that start with numbers.
Let us see if it works now. Regards ----- Original Message ----- From: "Joelle Dagnelies" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, September 26, 2003 5:02 PM Subject: Re: (ilwis-list) iff > Thank you for your answer but it doesn't work. I receive the same error > message :'operator' expected, Ilwis error 4020. It seems me too complicated > to make an irregular subset with Ilwis... > > Joelle Dagnelies > > > >From: "Bishwa Pandey" <[EMAIL PROTECTED]> > >Reply-To: "Ilwis-List" <[EMAIL PROTECTED]> > >To: "'Ilwis-List'" <[EMAIL PROTECTED]> > >Subject: Re: (ilwis-list) iff > >Date: Thu, 25 Sep 2003 10:44:24 -0400 > > > >Dear Joelle, > > > >1. Please use isundef function. This seems to work better than > >traditional Ilwis command you are using, specially for the value domain > >map. So please change your statement like this. > > > >sigma_parcelles:= IFF(isundef(parcellesnr),?,14oct02cal) > > > >2. For the mean value: You can use histogram value of raster map to > >group by in table calculation. > > > >Regards > > > >Bishwa Pandey > > > >Tel: 0058-212-9855726 > > > >Mobile:0058-414-1244345 > > > > > > > >Member - JICA Study Team > > > >Basic Plan for the Prevention and Attention of disaster for the > >Metropolitan Area of Caracas > > > >-----Mensaje original----- > >De: Joelle Dagnelies [mailto:[EMAIL PROTECTED] > >Enviado el: Jueves, 25 de Septiembre de 2003 10:10 a.m. > >Para: [EMAIL PROTECTED] > >Asunto: (ilwis-list) iff > > > >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 > > > >_________________________________________________________________ > >Hotmail: votre e-mail gratuit ! http://www.fr.msn.be/hotmail > > > > > > > > > > > > > >____________________________________________________________ > >Free 20MB Web Site Hosting and Personalized E-mail Service! > >Get It Now At Doteasy.com http://www.doteasy.com/et/ > > _________________________________________________________________ > Hotmail: votre e-mail gratuit ! http://www.fr.msn.be/hotmail > > ____________________________________________________________ Free 20MB Web Site Hosting and Personalized E-mail Service! Get It Now At Doteasy.com http://www.doteasy.com/et/ ________________________________________________________ To leave the ILWIS-LIST discussion list, send a email with 'unsubscribe ilwis-list' in the body to '[EMAIL PROTECTED]'
