How to sort the rows of an array according to another vector?

Question

Cantor Set 2020-2-18

回答： Star Strider 2020-2-18

If I have an array D:

D=[1 1 0 1 0 1; 4 6 7 8 9 9; 1 1 1 2 3 4]; b=[2 44 0];

each row in D crossponds to a number in b:

the first row crossponds to 2

the second row crossponds to 44

the third row crossponds to 0

I want to sort b in a descending order and according to the sorted vector b the rows of the array D are arranged such that

D=[4 6 7 8 9 9; 1 1 0 1 0 1; 1 1 1 2 3 4]; bb=sort(b,'descend');

Answer 1

Star Strider 2020-2-18

Try this:

D=[1 1 0 1 0 1; 4 6 7 8 9 9; 1 1 1 2 3 4]; 
b=[2 44 0];
[bb,idx] = sort(b,'descend');
Out = D(idx,:)

producing:

Out =
   6     7     8     9     9
   1     0     1     0     1
   1     1     2     3     4