• using R Under development (unstable) (2026-07-21 r90286 ucrt)
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• this is package 'FlexParamCurve' version '1.5-7'
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• checking examples ... [10s] ERROR Running examples in 'FlexParamCurve-Ex.R' failed The error most likely occurred in: > ### Name: extraF.nls > ### Title: Compare Two nls Models Using Extra Sum-of-Squares F-Tests > ### Aliases: extraF.nls > > ### ** Examples > > #fit and compare two nested nls models (7 vs 8 parameter models) > #create list for fixed parameters > modpar(posneg.data$age, posneg.data$mass, pn.options = "myoptions") [1] modpar will attempt to parameterize your data using the following sequential procedures: [1] (1) Extract parameter estimates for 8-parameter double-Richards curve in nls [1] (2) Use getInitial to retrieve parameter estimates for 8-parameter double-Richards curve [1] (3) Extract parameter estimates for 4-parameter Richards curve in [1] (4) Use getInitial to retrieve parameter estimates for 4-parameter Richards curve [1] if any approaches are successful, modpar will return these and terminate at that stage [1] [1] (1) Status of 8-parameter double-Richards curve fit in nls: [1] ....8 parameter nls fit failed [1] (2) Status of 8-parameter double-Richards getInitial call [1] ....8-parameter getInitial successful $Asym [1] 4427.343 $K [1] 0.07040843 $Infl [1] 30.13159 $M [1] 0.9867801 $RAsym [1] -1136.717 $Rk [1] 0.2112253 $Ri [1] 108.0177 $RM [1] 0.8085435 Warning messages: 1: In reorder(upper) :   different names for 'start' and 'upper': not reordering to match 2: In reorder(upper) :   different names for 'start' and 'upper': not reordering to match 3: In reorder(upper) :   different names for 'start' and 'upper': not reordering to match > richardsR1.nls <- nls(mass ~ SSposnegRichards(age, Asym = Asym, K = K, + Infl = Infl, M = M, RAsym = RAsym, Rk = Rk, Ri = Ri, RM = RM, modno = 1, pn.options = myoptions) + , data = posneg.data) Error in nls(mass ~ SSposnegRichards(age, Asym = Asym, K = K, Infl = Infl, :   singular gradient In addition: Warning message: In reorder(upper) :   different names for 'start' and 'upper': not reordering to match Execution halted
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Status: 1 ERROR