how to reorder the elements of a matrix
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A=[1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16]
i want to reorder the elements of A into
A=[16 15 12 8
11 14 13 10
7 4 3 6
9 5 2 1 ]
6 Commenti
Roger Stafford
il 30 Mar 2014
What would your pattern be if A were 5x5, 6x6, or nxn? Are you interested in generalizing in that manner?
Risposte (2)
Star Strider
il 29 Mar 2014
Modificato: Star Strider
il 29 Mar 2014
Here’s one solution. I have no idea if it can be generalised to other matrices.
B = flipud(A)
dl = size(A,1);
C = [];
for k1 = sum(size(A))-1 : -1 : 1
dg = diag(B,k1-dl)
if mod(k1,2) == 1
dg = flipud(dg)
end
C = [C; dg]
end
D = reshape(C,size(A))'
0 Commenti
Roger Stafford
il 29 Mar 2014
Here's a one-liner, though it doesn't exhibit the ingenuity that Star's does.
A = A([16,12,15,14;11,8,4,7;10,13,9,6;3,2,5,1]);
Like Star, I have no idea how this is supposed to generalize. I think you will have to give many more examples or else a more thorough explanation than "zig-zag" if the logic behind this request is to be understood, Alina.
2 Commenti
Image Analyst
il 30 Mar 2014
Modificato: Image Analyst
il 30 Mar 2014
Nice and simple. She did not ask for it to be generalized. Hence, this is what she gets as the most direct answer. If she comes back and says "how can I generalize?" then you can say "Well, why didn't you say so in the beginning!?!?"
Sagar Damle
il 30 Mar 2014
Modificato: Sagar Damle
il 31 Mar 2014
I think to generalize the answer for this question,one can work on code for function 'pascal()' available in MATLAB.I have not got the logic in that code uptil now,but though I think that the code will help in zig-zag coding.
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