[R] Applying a transformation to multiple data frame columns

[Dimitri Shvorob]

How can one simplify the folowing?

t$aum[is.na(t$aum)] = 0; t$aum.core[is.na(t$aum.core)] = 0
t$num[is.na(t$num)] = 0; t$num.core[is.na(t$num.core)] = 0

Thank you.
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