How to create a pivot table in R with multiple (3+) variables

Question

I am having problems in create a pivot table with a data frame like this:

c1   c2          c3         c4
E   5.76         201    A la vista
E   47530.71              


        

Answer 1

You can do this with dcast from the reshape2 package:

dcast(mydata, c1 + c3 ~ c4, value.var="c2", fun.aggregate=sum)

For example:

library(reshape2)
# reproducible version of your data
mydata = read.csv(text="c1,c2,c3,c4
    E,5.76,201,A la vista
    E,47530.71,201,A la vista
    E,82.85,201,A la vista
    L,11376.55,201,A la vista
    E,6683.37,203,A la vista
    E,66726.52,203,A la vista
    E,2.39,203,A la vista
    E,79066.07,202,Montoxv_a60d
    E,14715.71,202,Montoxv_a60d
    E,22661.78,202,Montoxv_a60d
    L,81146.25,124,Montoxv_a90d
    L,471730.2,124,Montoxv_a186d
    E,667812.84,124,Montoxv_a186d", header=TRUE)
result = dcast(mydata, c1 + c3 ~ c4, value.var="c2", fun.aggregate=sum)

produces:

  c1  c3 A la vista Montoxv_a186d Montoxv_a60d Montoxv_a90d
1  E 124       0.00      667812.8          0.0         0.00
2  E 201   47619.32           0.0          0.0         0.00
3  E 202       0.00           0.0     116443.6         0.00
4  E 203   73412.28           0.0          0.0         0.00
5  L 124       0.00      471730.2          0.0     81146.25
6  L 201   11376.55           0.0          0.0         0.00