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...y.net/dogle/fishR/gnrlex/VonBertalanffy/VonBertalanffy.pdf. Specifically the section on VBGM Comparisons between groups. ? This code is pretty cut and dry. I am able to run it perfectly with the "fake" data that is provided. But when I run it with my own data I get stuck with this line: fitGen <- nls(vbGen,data=LMB,start=svGen) ? I get this error code: Error in numericDeriv(form[[3L]], names(ind), env) : Missing value or an infinity produced when evaluating the model. ? Does anyone know how to fix it? I have no missing values and do not know how to fix the infinity produced. Here i...

...have more data points with this species, and it is ordered exactly the same as the other species I have been working with.   The two errors I get are for these specific lines of code: This error I actually got with all the data sets but its just assumption checking so I did this manually. > fitGen <- nls(vbGen,data=BLG,start=svGen) Error in nlsModel(formula, mf, start, wts) :   singular gradient matrix at initial parameter estimates and This code is only not working with this data set. > fitK <- nls(vbK,data=BLG,start=svK) Error in numericDeriv(form[[3L]], names(ind), env) :...