In RStudio the following code will return 3 2 when I use the dim function. Can someone explain to me step-bystep how RStudio gets to the following result?  dfch <- data.frame(   "City" = c("St.Gallen", "Lausanne", "Zürich" ),   "PartyLeft" = c(35, 45, 55),   "PartyRight" = c(40, 35, 30) )   dim(dfch[ , dfch$PartyLeft > 40]   Also when we use dfch[ , dfch$PartyLeft > 40 ] returns a 3x2 matrix with column PartyLeft and PartyRight. How does RStudio proceed to get to that answer?

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