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rdataframeunique

How do I calculate total number of unique values in a dataframe?

Here's a sample dataframe:

>frame

  X1 X2 X3 X4
1  F  F  F  F
2  C  C  C  C
3  D  D  D  D
4 A# A# A# A#

When I run unique(c(frame)) I get a vector of the four unique values, "F", "C", "D", "A#". However, if I run length(unique(c(frame))), I get a length of 1. So I'm looking for a way to get the total number of unique values in a dataframe, and also in a subset of the dataframe.

Solution

  • Per @DatamineR:

    length(unique(unlist(df)))