正在创建拟合模型，但是在尝试过程中频繁出现warning message
以下是代码
#此方式涉及到ggplot2代码包
library(ggplot2)
test_original_data<-read.csv(file.choose())
attach(test_original_data)
qplot(气温T,发育速率Ro,xlab="气温",ylab="发育速率Ro",xlim=c(10,30),ylim=c(0,max(发育速率Ro)),col=树种Species)
Ro_Pa <- test_original_data[树种Species=='Pa',"发育速率Ro"]
T_Pa <- test_original_data[树种Species=='Pa',"气温T"]
formula_Pa <-Ro_Pa ~ c/(1+exp(a*T_Pa+b))
data_Pa <- test_original_data[树种Species=='Pa',]
b <- 10
mod.1<-nls(formula_Pa, data=data_Pa,start = list(c=100,a=-1))
反复出现的warning message:
Warning messages:
1: In min(x) : no non-missing arguments to min; returning Inf
2: In max(x) : no non-missing arguments to max; returning -Inf
参考网站是
http://blog.sciencenet.cn/home.php?mod=space&uid=50573&do=blog&id=1105645&tdsourcetag=s_pcqq_aiomsg
