Calculate row-wise proportions

by

following should do the trick

cbind(id = x[, 1], x[, -1]/rowSums(x[, -1]))
##   id       val0      val1      val2
## 1  a 0.08333333 0.3333333 0.5833333
## 2  b 0.13333333 0.3333333 0.5333333
## 3  c 0.16666667 0.3333333 0.5000000

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