Extracting rows from a data.frame

Question

I have a n by m data.frame where column 1 has the information of interest. I want to create sub data.frames based upon what the value in a row of colum

Answer 1

Instead of :

s <- data.frame(df1$P = S)

try:

s <- data.frame(df1[df1$P == S,])

or

s <- data.frame(df1[df1$P == 'S',])

if you want to control number of rows try:

s <- data.frame(df1[df1$P == 'S',1:5])