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col2
2017 Jun 21
4
selecting dataframe columns based on substring of col name(s)
Suppose I have the following sort of dataframe, where each column name
has a common structure: prefix, followed by a number (for this example,
col1, col2, col3 and col4):
d = data.frame( col1=runif(10), col2=runif(10),
col3=runif(10),col4=runif(10))
What I haven't been able to suss out is how to efficiently
'extract/manipulate/play with' columns from the data frame, making use