Merge dataframe based on column in R -

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hi have following data frame:

css_week_end_date   bv  bvg  bvh bvg1 bvg2 bvg3 bvg4 bvh1 bvh2 bvh3 bvh4 bvh5 bvg11 bvg12 bvg13 bvg14 bvg15 bvg16 bvg21 bvg22 bvg23 bvg24 bvg25 bvg31 bvg32 bvg34 1        2012-01-13 28.0 28.3 27.7 28.6 28.7 27.3 28.7 29.5 27.2 26.5 27.8 27.5  34.3  30.7  29.8  25.9  25.7  28.0  29.9  33.9  26.2  32.0  24.4  29.3  24.0  26.9 2        2012-01-20 28.8 29.5 28.4 31.8 29.2 28.2 28.9 30.0 27.8 27.4 28.0 28.7  37.9  34.3  33.3  30.7  27.1  31.6  28.6  32.6  29.3  32.8  24.5  31.5  24.0  27.8 3        2012-01-27 28.2 28.6 27.9 30.7 28.4 27.4 28.0 29.7 27.5 26.9 27.4 28.0  34.8  29.3  32.8  29.5  28.3  31.3  26.9  33.2  27.0  31.3  25.4  30.8  23.4  25.9 4        2012-02-03 28.1 28.2 28.1 30.6 27.6 27.0 27.8 30.5 27.5 25.9 27.5 28.9  37.9  29.1  31.7  30.0  26.8  31.9  26.4  32.3  26.6  31.3  23.5  30.5  21.7  26.3 5        2012-02-10 27.9 28.1 27.7 30.5 27.9 27.0 27.5 30.4 26.8 26.2 26.4 28.5  35.9  30.0  30.8  30.5  25.8  32.9  26.1  32.1  26.2  31.4  25.2  30.6  24.1  25.6 6        2012-02-17 26.4 26.8 26.0 30.6 26.8 24.0 26.5 29.1 25.6 24.3 24.8 26.4  36.1  31.5  29.6  30.0  25.5  33.1  25.2  32.6  24.8  30.3  23.1  26.2  20.3  22.5

i want transform data set this:

css_week_end_date   patch   drive.per.task 13/01/2012              bv  28 20/01/2012              bv  28.8 27/01/2012              bv  28.2 03/02/2012              bv  28.1 10/02/2012              bv  27.9 13/01/2012              bvg 28.3 20/01/2012              bvg 29.5 27/01/2012              bvg 28.6 03/02/2012              bvg 28.2 10/02/2012              bvg 28.1 13/01/2012              bvh 27.7 20/01/2012              bvh 28.4 27/01/2012              bvh 27.9 03/02/2012              bvh 28.1 10/02/2012              bvh 27.7 ...

how in optimal way in r. having copy , paste in excel painful task have many patches shown in example above

if data frame name df, can try this:

library(reshape2) melt(df, id='css_week_end_date', value.name='drive.per.task', variable.name='patch')

if don't have library reshape2, can install this:

install.packages('reshape2')

let me know if helps.


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