How to formulate a statement in r? -

so question: have been given data set , instruction are:

growth patterns generated transforming x variable new categorical variable, can named "growth". first category assigned islands in x variable between 15 50.

so question, main headache how write "between 15 50 in r language. have

growth$mediumgrowth.islands <- growth$sasiaurban.x[growth$sasiaurban.x ???] 

but not know command put in ??? part.

let's reproducible:

set.seed(47) df <- data.frame(x = sample(60, 100, replace = true)) 

your exact questions, how write "between 15 , 50" answered telling r "greater 15 and less 50":

## what's between 15 , 50? df$x > 15 & df$x <= 50 

that gives vector of true/false. it's same length x , true when criteria match (between 15 , 50), , false otherwise. (nb: used greater 15 , less or equal 50, might want adjust that.) filling "???" growth$sasiaurban.x[growth$sasiaurban.x > 15 & growth$sasiaurban.x <= 50].

## assign new column df$between15and50 <- df$x > 15 & df$x <= 50 

if want more categories, makes sense them @ once, , cut makes easy:

## or use cut cut(df$x, breaks = c(0, 15, 50, 100))  df$category <- cut(df$x, breaks = c(0, 15, 50, 100))  ## adding labels instead df$category2 <- cut(df$x, breaks = c(0, 15, 50, 100),     labels = c("low", "medium", "high"))  head(df)