How to move cells with a value row-wise to the left in a dataframe [duplicate]

Answer 1

You can grab my naLast function from my "SOfun" package.

The result would be a matrix, but you can easily wrap it in as.data.frame if you want:

as.data.frame(naLast(mydf, by = "row"))
#    X1 X2   X3   X4
# x1  a  b    c 
# x2  d  e  
# x3  f  g    h    i
# x4  j  k    l 

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Install the package with:

library(devtools)
install_github("mrdwab/SOfun")