各位坛友好！我通过以下for循环代码想选出AIC最小的arma+garch模型
for (m in 1:2) for (n in 1:2)
{
  {fit.garch <- garchFit(formula = ~arma(3,3)+garch(m,n),data = A2,trace = F)
  if(fit.garch$aic<f)
  {f <- fit.garch$aic
  garchcoeff_1 <- m
  garchcoeff_2 <- n}
  }
}
为什么会出现以下错误？
[1] "data" "m"    "n"   
[1] "data"
Show Traceback

Rerun with Debug
Error in .garchArgsParser(formula = formula, data = data, trace = FALSE) :
  Formula and data units do not match.