Dplyr summarise_each to aggregate results

Question

I have a data frame as such:

    metric1    metric2    metric3 field1 field2
1   1.07809668  4.2569882  7.1710095      L     S1
2   0.56174763  1.2660273 -0.3751915      L     S2
3   1.17447327  5.5186679 11.6868322      L     S2
4   0.32830724 -0.8374830  1.8973718      S     S2
5  -0.51213503 -0.3076640 10.0730274      S     S1
6   0.24133119  2.7984703 15.9622215      S     S1
7   1.96664414  0.1818531  2.7416768      S     S3
8   0.06669409  3.8652075 10.5066330      S     S3
9   1.14660437  8.5703119  3.4294062      L     S4
10 -0.72785683  9.3320762  1.3827989      L     S4

I am showing 2 fields but have several more. I need to sum the metrics grouped by each field e.g. for field1:

DF %>% group_by(field1) %>% summarise_each(funs(sum),metric1,metric2,metric3)

I can do this for each field where the columns would be sum(metric1), sum(metric2), sum(metric3), but the table output I need is something like this:

L(field1) S(field1) S1(field2)  S2(field2) S3(field2)  S4(field2)
sum(metric1)

sum(metric2)

sum(metric3)

I believe there must be a way to do this using tidyr along with dplyr but cannot figure it out

Answer 1

Try recast from reshape2 package

library(reshape2)
recast(DF, variable ~ field1 + field2, sum)
#   variable     L_S1      L_S2       L_S4       S_S1       S_S2      S_S3
# 1  metric1 1.078097  1.736221  0.4187475 -0.2708038  0.3283072  2.033338
# 2  metric2 4.256988  6.784695 17.9023881  2.4908063 -0.8374830  4.047061
# 3  metric3 7.171010 11.311641  4.8122051 26.0352489  1.8973718 13.248310

which is the same as

dcast(melt(DF, c("field1", "field2")), variable ~ field1 + field2, sum)

You also can combine it with tidyr::gather if you want, but you can't use tidyr::spread because it doesn't have fun.aggregate argument

DF %>%
  gather(variable, value, -(field1:field2)) %>%
  dcast(variable ~ field1 + field2, sum)
#   variable     L_S1      L_S2       L_S4       S_S1       S_S2      S_S3
# 1  metric1 1.078097  1.736221  0.4187475 -0.2708038  0.3283072  2.033338
# 2  metric2 4.256988  6.784695 17.9023881  2.4908063 -0.8374830  4.047061
# 3  metric3 7.171010 11.311641  4.8122051 26.0352489  1.8973718 13.248310