don’t use eachrow
test = DataFrame(a = 1:10, b = rand(10), c=[2,2,2,2,2,5,5,5,5,5], d = 1:10)
test[test.c .== 5, :d] .= 1
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don’t use eachrow
test = DataFrame(a = 1:10, b = rand(10), c=[2,2,2,2,2,5,5,5,5,5], d = 1:10)
test[test.c .== 5, :d] .= 1