R change one column of a data.frame to a binary vector -


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i have read file data.frame in r, , can see 5th column contains values separated ";". possible turn data.frame larger data.frame , expand 5th column binary vector?

> head(uinfo)       v1   v2 v3  v4                             v5 1 100044 1899  1   5    831;55;198;8;450;7;39;5;111 2 100054 1987  2   6                              0 3 100065 1989  1  57                              0 4 100080 1986  1  31 113;41;44;48;91;96;42;79;92;35 5 100086 1986  1 129                              0 6 100097 1981  1  75                              0

so, simpler example, if first 2 rows are:

1 100044 1899  1   5    1;2;4;7 2 100054 1987  2   6    3;8

i want get:

1 100044 1899  1   5    1 1 0 1 0 0 1 0 0 0 2 100054 1987  2   6    0 0 1 0 0 0 0 1 0 0

do have use program such python preprocessing of data, or possible apply function?

thanks

you can try concat.split.expanded function "splitstackshape" package:

library(splitstackshape) mydf #       v1   v2 v3 v4      v5 # 1 100044 1899  1  5 1;2;4;7 # 2 100054 1987  2  6     3;8 concat.split.expanded(mydf, "v5", sep=";", fill = 0) #       v1   v2 v3 v4      v5 v5_1 v5_2 v5_3 v5_4 v5_5 v5_6 v5_7 v5_8 # 1 100044 1899  1  5 1;2;4;7    1    1    0    1    0    0    1    0 # 2 100054 1987  2  6     3;8    0    0    1    0    0    0    0    1

add drop = true rid of original column.

here, "mydf" defined as:

mydf <- structure(list(v1 = c(100044l, 100054l), v2 = c(1899l, 1987l),      v3 = 1:2, v4 = 5:6, v5 = c("1;2;4;7", "3;8")), .names = c("v1",  "v2", "v3", "v4", "v5"), class = "data.frame", row.names = c(na, -2l))

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