R - replace values in data frame using lookup table

Question

I was having some trouble lately trying to replace specific values in a data frame or matrix by using a lookup-table.

So this represents the original.data to be modi

Answer 1

you can try :

# x the original.data (a matrix)
# y the lookup.table
x2 <- y[match(x, y[,1]),2]
dim(x2) <- dim(x)
table(x, x2)
     x2
x       1   2   3   4   5 255
  1    13   0   0   0   0   0
  2     0  22   0   0   0   0
  3     0   0  29   0   0   0
  4     0   0   0   8   0   0
  5     0   0   0   0  11   0
  6     0   0   4   0   0   0
  7     0   4   0   0   0   0
  8     0   5   0   0   0   0
  255   0   0   0   0   0 100