r - Error in if function -

i have run long script decide model should use forecast. after doing accuracy tests on in , out samples of data created large if function find model best results of either "arima", "arima.wgt", "addhw", "multhw", "addhwwgt" , "multhwwgt". during script have got forecasts each of these models , want use if function view them have written

if(maxmod<-"arima")   modelf<-arimaaltfa else     if(maxmod<-"arima.wgt")       modelf<-arimaaltfb else         if(maxmod<-"addhw")           modelf<-hwabfc else             if(maxmod<-"multhw")               modelf<-hwmbfd else                 if(maxmod<-"addhwwgt")                   modelf<-hwaaltfe else                     modelf<-hwmaltff 

but keep getting error

error in if (maxmod <- "arima") modelf <- arimaaltfa else if (maxmod <- "arima.wgt") modelf <- arimaaltfb else if (maxmod <- "addhw") modelf <- hwabfc else if (maxmod <- "multhw") modelf <- hwmbfd else if (maxmod <- "addhwwgt") modelf <- hwaaltfe else modelf <- hwmaltff :    argument not interpretable logical 

this has happened many different things have tried eg instead of modelf<-"" tried view("",title="") , modelf<-view("",title="") still saya isn't logical... there error in way have written or there problem?

extra detail , code available if needed

you need switch function.

modelf <- switch(   maxmod,   arima     = arimaaltfa,   arima.wgt = arimaaltfb,   addhw     = hwabfc,   multhw    = hwmbfd,   addhwwgt  = hwaaltfe,   hwmaltff ) 

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your specific problem trying assign values maxmod instead of comparing equality. although switch statement preferable, try replacing

if(maxmod<-"arima") 

with

if(maxmod == "arima") 

maxmod == "arima" returns true or false (a logical value).

maxmod<-"arima" assigns value "arima" variable named maxmod (and invisibly returns string).