topic Re: Sorting list of lists in Discussions

Sorting list of lists

ts2 — Fri, 09 Jun 2023 16:59:46 GMT

JMP12

How to sort a list of lists by one list in the list of lists?

For example I want to sort by the numeric part of this list.

I know I could iterate or make a table to sort this way, but is there a one-liner I don't know of? I feel like there must be an easier way to do it.

list = {{"a", "b", "c", "d"}, {2, 3, 4, 1}};

a,2

b,3

c,4

d,1

(list[1] and list[2] sorted by list[2])

{{"d", "a", "b", "c"}, {1, 2, 3, 4}};

d,1

a,2

b,3

c,4

Craige_Hales — Sat, 21 May 2022 10:34:06 GMT

You probably want the rank function. See .

list = {{"a", "b", "c", "d"}, {2, 3, 4, 1}};

r = rank(list[2]);
list[1] = list[1][r];
list[2] = list[2][r];

show(list);

list = {{"d", "a", "b", "c"}, {1, 2, 3, 4}};

rank() returns a vector of indexes that retrieve the elements in order.

ts2 — Sat, 21 May 2022 14:03:23 GMT

Thanks this is exactly what I was looking for.