[R] Expand dataframe according to limits defined per row

[darkgaze]

Hi all,

Would appreciate help with transforming this:

A B C D
a 2 1 4
b 3 3 5

into this:

A B E
a 2 1
a 2 2
a 2 3
a 2 4
b 3 3
b 3 4
b 3 5

(C<=E<=D)

Best,
Don

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