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yield_rate
2010 Dec 23
5
Writing a single output file
...10 6.41
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Thus all the output files have same column names viz. Date and yield_rate. Also, I do need these files individually too.
My further requirement is to have a single dataframe as given below.
Date yield_rate1 yield_rate2 yield_rate3
12/23/2010 5.25 4.16 6.15
12/22/2010 5.19 4.59 6.41
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