[R] remove loop which compares row i to row i-1
jcrosbie
james at crosb.ie
Thu Jul 12 19:55:21 CEST 2012
Thank you,
I am sorry but I am still trying to figure out how to make the function
work.
I have a column called tUnitsort$BlockNumber which can range from 0 to 6.
I have another two columns with the date and the hour ending for the given
day.
Example
Date Hour BlockNumber MyTo NewColumn
2011-01 1 2 140 140
2011-01 1 1 70 140
2011-01 1 0 0 140
2011-02 1 2 160 160
2011-02 1 1 70 160
2011-02 1 0 0 160
2011-03 1 2 150 150
I want to create a NewColumn which will place the MyTo number for the
highest block number for the rest blocks in a given hour ending within a
day.
ifelse(tUnitsort[,4]>=tUnitsort[-1,4],tUnitsort[,7],tUnitsort[-1,7])
I am unsure how to refference the element before in this case. I thought
the -1 was doing this but I believe I'm wrong now.
http://r.789695.n4.nabble.com/file/n4636337/BR3_2011_New.csv
BR3_2011_New.csv
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