Extracting columns having greater than certain values in R dataframe

Question

I have a dataframe:

Alix    Blim    Jux Gyno
0.105   0.234   0.67    0.89
0.01    0.542   0.11    0.65
0.003   0.002   0.6     0.67
0.009   0.123   0.09    0.01
         


        

Answer 1

df <- read.table(text='Alix    Blim    Jux Gyno
0.105   0.234   0.67    0.89
0.01    0.542   0.11    0.65
0.003   0.002   0.6     0.67
0.009   0.123   0.09    0.01
', header=T)

We can use sapply to find the max value in each column, then check if it's greater than 0.6. This gives a logical vector which we can use to subset df by column:

df[,sapply(df, max) > 0.6]

   Jux Gyno
1 0.67 0.89
2 0.11 0.65
3 0.60 0.67
4 0.09 0.01