Hi, everyone,

I was trying to sort a data frame by two columns, one increasing, the other
decreasing  and got an error.

"Error in FUN(left) : invalid argument to unary operator",

The command is "BA[order(BA[1],-BA[2]),]". BA is the data frame. It was
working if I used increasing on both columns.

Why the decreasing symbol "-" is not working here? Thanks.

-- 
Jun Shen PhD
PK/PD Scientist
BioPharma Services
Millipore Corporation
15 Research Park Dr.
St Charles, MO 63304
Direct: 636-720-1589

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