Pivot Table-like Output in R?

Question

I am writing a report that requires the generation of a number of pivot tables in Excel. I would like to think there is a way to do this in R so that I can avoid Excel. I would

Answer 1

Using JD Long's simulated data, and adding the sd and counts:

   library(reshape)  # not reshape2
   cast(myDf.melt, school + teacher ~ ., margins=TRUE , c(mean, sd, length))
   school teacher     mean       sd length
1    BSA1    Dick 4.663140 3.718773     14
2    BSA1   Harry 4.310802 1.430594      9
3    BSA1     Tom 5.505247 4.045846      4
4    BSA1   (all) 4.670451 3.095980     27
5    BSA2    Dick 6.110988 2.304104     15
6    BSA2   Harry 5.007221 2.908146      9
7    BSA2     Tom 4.337063 2.789244     14
8    BSA2   (all) 5.196018 2.682924     38
9    HSA1    Dick 4.508610 2.946961     11
10   HSA1   Harry 4.890741 2.977305     13
11   HSA1     Tom 4.721124 3.193576     11
12   HSA1   (all) 4.717335 2.950959     35
13  (all)   (all) 4.886576 2.873637    100