To do this, we’re going to use the subset command. We are also going to save a copy of the results into a new dataframe (which we will call testdiet) for easier manipulation and querying.Nrowand length do the rest. # subset in r example testdiet <- subset(ChickWeight, Diet==4) ...
To select a specific column, you can also type in the name of the dataframe, followed by a $, and then the name of the column you are looking to select. In this example, we will be selecting the payment column of the dataframe. When running this script, R will simplify the result ...
the data passed to the transformation function is stored as a list rather than a data frame, so when reading from the .xdf file we set thereturnDataFrameargument to FALSE to emulate this behavior. Since we only use the variableagein our transformation function, we restrict the variables extrac...