st: Right to Left Column Cascade or Adjustment

[David Torres <torresd@umich.edu>]

There's probably a proper name for the process I'd like to carry out.

Say I have five columns of information with staggard cell inputs.  How  
do I go about moving all the information in a subsequent column back  
through to the first column for which no information is missing on the  
row?

I'd like to go from something like this:

Col1   Col2     Col3    Col4    Col5

101     101
        111      333
                                 935
                        023      016
405              295


to something like this

Col1   Col2     Col3    Col4    Col5

101     101
111     333
935
023     016
405     295


Thanks,
Diego
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