R语言的wday函数代码怎么写

代码如下：
eme<-dplyr::mutate(ds,t=1:length(date),
dow=wday(date),
tm03=mean(tm,0:3),"
pm10L0 = pm10/10,"
pmcL0 = pmc/10,"
pm25L0 = pm25/10)"
错误如下：

Error: unexpected symbol in:
" pm10L0 = pm10/10,"
pmcL0"
Error: unexpected ')' in " pm25L0 = pm25/10)"
怎么改