Errorggplot(Errorinseq.int(0,to0-from,by):'to'mustbefinite)为了用ggplot2绘制数据，我遇到了以下错误。可用的命令、数据和错误类型如下：123456789101112131415161718192021222324252627282930313233343536373839404142434445require(ggplot2)require(reshape2)dfdf[3]=c( "Normal", "Normal",      "Normal",      "Normal",      "Normal",      "Norma