[R] remove loop which compares row i to row i-1

[jcrosbie]

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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