Last updated on June 1, 2017
Data frames in R
A useful feature of R is the data.frame.
What is a data.frame?
Without being an expert in R: a data.frame is like a table. So when I read a table from a .csv file, then it read it into a data.frame.
Reshape data with a data.frame on the fly
A very useful feature of a data.frame is that I can construct it, on the fly, so to speak.
Let’s say I make a list that could correspond to column, in ordinary English.
And now imagine that I concatenate ten letters into a row:
I can make data.frame of two columns with col1, as is, and row1 turned into a column.
This is a very handy piece of data reshaping and I can do this with any combination of numbers.
I can also make this a bit neater add headings to my columns by extending the command
data.frame(vname1 = col1, vname2 = row1)
If I need to return this from a function then of course I place the command in the line above where the x is: return(x)
If I need to put the data.frame into an object, then myobjectname<-data.frame(vname1 = col1, vname2 = row1)