All - firstly apology if this is a very basic question but i tried myself
and could not find a satisfied answer.

I know that i can subset a dataframe using dataframe[row,column] and if i
give dataframe[row,] that specific row is provided and similarly i can do
dataframe[,column] to get the entire column.

what i don't understand is that if i do dataframe[<conditional
expression>]and don't provide the 'comma' what is being returned

e.g. i have the below code:

manager <- c(1, 2, 3, 4, 5)
date <- c("10/24/08", "10/28/08", "10/1/08", "10/12/08", "5/1/09")
country <- c("US", "US", "UK", "UK", "UK")
gender <- c("M", "F", "F", "M", "F")
age <- c(32, 45, 25, 39, 99)
q1 <- c(5, 3, 3, 3, 2)
q2 <- c(4, 5, 5, 3, 2)
q3 <- c(5, 2, 5, 4, 1)
q4 <- c(5, 5, 5, NA, 2)
q5 <- c(5, 5, 2, NA, 1)
leadership <- data.frame(manager, date, country, gender, age, q1, q2, q3,
q4, q5, stringsAsFactors=FALSE)

now if i do


leadership[leadership$country == "US",]

two row are being returned as



  managerID JoinDate country gender age q1 q2 q3 q4 q5 agecat
1         1 10/24/08      US      M  32  5  4  5  5  5  Young
2         2 10/28/08      US      F  45  3  5  2  5  5  Young


but if i do

leadership[leadership$country == "US"] to get the entire data frame
where country is US i am getting below


  managerID JoinDate q1 q2 agecat
1         1 10/24/08  5  4  Young
2         2 10/28/08  3  5  Young
3         3  10/1/08  3  5  Young
4         4 10/12/08  3  3  Young
5         5   5/1/09  2  2   <NA>



Please guide me what am i doing wrong.


Thanks

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