[R] using a value in a column to "lookup" data in a certian column of a dataset?
ruser2006 at yahoo.com
Wed Mar 15 00:59:17 CET 2006
I have a dataset with 20 columns and ~600,000 rows.
Column 1 has a number from 2-19. This number tells
me, for each row, which column has the applicable
data. (i.e. the data that I wish to use for each
I want to create a vector that contains the data from
the value in column 1.
If column 1, row 1, has a value of 6, I want to
obtain the value in column 6, row1.
If column1, row 2, has value of 2, I want to obtain
the value in column 2, row2. etc
I have created a for next loop to do this, but am
looking for a more efficient manner.
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