How to find highest value in a data frame?

Question

I have a dataframe x with this values:

   x1  x2  x3
1  NA   4   1
2  NA   3  NA
3   4  NA   2
4  NA   1  11
5  NA   2  NA
6   5  NA   1
7   5   9           


        

Answer 1

To find the sum of a column, you might want to unlist it first;

max(unlist(myDataFrame$myColumn), na.rm = TRUE)

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