> stormdata$FATALITIES <- as.numeric(stormdata$FATALITIES)
Warning message:
NAs introduced by coercion
> stormdata$INJURIES <- as.numeric(stormdata$INJURIES)
Warning message:
NAs introduced by coercion
> stormdata$EVTYPE <- toupper(stormdata$EVTYPE)
Error in toupper(stormdata$EVTYPE) : invalid multibyte string 566138
> eventtype <- sort(unique(stormdata$EVTYPE))
> stormdata$EVTYPE <- toupper(stormdata$EVTYPE)
Error in toupper(stormdata$EVTYPE) : invalid multibyte string 566138
请教出现这个错误是咋整啊,感谢!!!