Aviad Klein over at My ContRibution wrote a convenient R function to list the classes of all the vectors that make up a data.frame. You would think apply(kyphosis,2,class) would do the job but it doesn’t – it calls every vector a character class. Aviad wrote an elegant little function that does the job perfectly without having to load any external package:

allClass<-function(x) {unlist(lapply(

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