r - Selecting rows using grep vs using == -


i brand new r

i tried select rows dataset using following:

1. completeresults <- results[ results$final_status=="tsicompleted"]

it returned full dataset though (seemingly) logical equivalent works:

2. timestrimmed<-times[times$totaltimemins<60,]

then after doing research, tried following work:

3. completeresults <- results[grep("tsicompleted", results$final_status), ]

why 2 work 1 doesn't work?

thanks

missing comma

completeresults <- results[ results$final_status=="tsicompleted",]

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