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...ian and this does not mean anything for me! help would be very appreciated. Many thanks -- ___________________________________________________ Christophe NGUYEN UMR 1220 INRA-ENITAB Transfert sol-plante et cycle des ?l?ments min?raux dans les ?cosyst?mes cultiv?s" Centre INRA de Bordeaux-Aquitaine 71, avenue Edouard Bourlaux, BP 81 33883 Villenave d'Ornon, FRANCE Tel : 00 33 (0)5 57 12 25 07 Fax : 00 33 (0)5 57 12 25 15 email : Christophe.Nguyen at bordeaux.inra.fr page infoservice: http://www.bordeaux.inra.fr/tcem __________m?O?m____________________________________

...symbol as there is levels in the z variable for each panel? Thanks for the help. Chris -- ___________________________________________________ Christophe NGUYEN UMR 1220 INRA-ENITAB Transfert sol-plante et cycle des ?l?ments min?raux dans les ?cosyst?mes cultiv?s" Centre INRA de Bordeaux-Aquitaine 71, avenue Edouard Bourlaux, BP 81 33883 Villenave d'Ornon, FRANCE Tel : 00 33 (0)5 57 12 25 07 Fax : 00 33 (0)5 57 12 25 15 email : Christophe.Nguyen at bordeaux.inra.fr page infoservice: http://www.bordeaux.inra.fr/tcem __________m?O?m____________________________________

...tmid1, tmid2, scal1and scal2. My question is how could I estimate those initial values so that the nls fitting works. Thanks in advance -- Nathalie YAUSCHEW-RAGUENES Ph.D Student Unit? de Recherches Ecologie Fonctionnelle et Physique de l'Environnement (EPHYSE) INRA, Centre de Bordeaux - Aquitaine 71 Av Edouard Bourlaux 33883 Villenave d'Ornon Cedex France

...ly I want to know if the parameters are different are not beteween this 2 models. Is there a way to do it simply in R? Thanks in advance -- Nathalie YAUSCHEW-RAGUENES Ph.D Student Unit? de Recherches Ecologie Fonctionnelle et Physique de l'Environnement (EPHYSE) INRA, Centre de Bordeaux - Aquitaine 71 Av Edouard Bourlaux 33883 Villenave d'Ornon Cedex France T?l : +33 (0)5 57 12 24 31 Fax : +33 (0)5 57 12 24 20 e-mail : nathalie.yauschew-Raguenes at bordeaux.inra.fr