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How the the program executed? how the output is 5? cant understand the part of y,z and print part
What is the output of this code? x <- data.frame( "a" = c(7, 42, 3, 5), "b" = c("a","b","c","d") ) y <- subset(x, a < 10) z <- max(y$a) print(min(mean(y$a), z))
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x stores the data in a table-like structure.
y is a subset of x: You only keep the table rows where "a" is smaller than 10.
print x and y and compare them
z is the max value in the "a"-column of y
solve the last line from inner to outer: mean gives the mean value of "a"-column in y. min gives the minimum: either the mean or z.