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I have sorted the data firstly by the 3rd column and then by the 2nd column as below:-

a = RandomInteger[20, {30, 3}]
SortBy[a, {#[[3]], #[[2]]} &]

As you can see, now they are both sorted in ascending order. But I need the 3rd column to be sorted by descending order, while the 2nd should be sorted in ascending order. What should I do?

Many thanks!

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Maybe 

SortBy[a, {-#[[3]], #[[2]]} &];

?

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  • $\begingroup$ Thanks... I was stuck at how to combine the Greater option with it... $\endgroup$
    – H42
    Jun 15, 2018 at 22:58
  • $\begingroup$ You're welcome. $\endgroup$
    – Henrik Schumacher
    Jun 15, 2018 at 23:01

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