2 vectors compare it
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Hello, Ineed help with this question. I have 2 vectors to compare. Matrix below is a simplified vector with 2 columns that I want to compare. I want to move across the columns from column 1 to column 2 to column 1 continously till the end of the vector in an ascending order. If I move across , I record a value +ve, if I move within the same column, I record -ve. E.g
2 to 3 is +ve
3 to 4 is +ve
4 to 5 is +ve
5 to 7 is -ve( same column)
7 to 9 is -ve of -ve = +ve (same column movement)
9 to 10 is +ve
10 t0 12 is +ve
12 to 16 is +ve
16 to 17 is -ve
17 to18 is +ve
18 to 19 is +ve
19 to20 is +ve
4 个评论
Dyuman Joshi
2022-11-9
You have skipped 12 to 15 and 15 to 16. Was that a mistake or intentional?
If it was intentional, what is the logic behind it?
Joshua Folorunso
2022-11-9
The OP has modified this question multiple times, finally deciding that they will delete it entirely. Note to OP: this kind of behavior is not appreciated on this forum.
Backups of the main versions of this question:
Rena Berman
2022-12-27
(Answers Dev) Restored edit
采纳的回答
I will assume here that the oddity mentioned above by @Dyuman Joshi is an error in the presentation of the example.
A=[2 3
4 5
10 7
15 9
16 12
17 18
19 20];
A=A';
B=A*0+[1;2];
[~,is]=sort(A(:));
B=2*abs(diff(B(is))')-1 %result
7 个评论
A variation without the need of B
A=[2 3
4 5
10 7
15 9
16 12
17 18
19 20];
[~,is] = sort(A(:));
Vesign = 2*abs(diff(is>size(A,1)))-1
Dyuman Joshi
2022-11-9
According to the statement provided above, expectec output should have 12 values, instead of 13 that you have gotten.
Bruno Luong
2022-11-9
编辑：Bruno Luong
2022-11-9
You have 7 x 2 = 14 numbers, so 13 pairs of succesive numbers
2
3
4
5
7
9
10
12
15
16
17
18
19
20
@Dyuman Joshi has asked you miss the 12-15, 15-16 (you jump from 12-16, skipping 15) and you never answer why 15 is skipped.
Joshua Folorunso
2022-11-9
Joshua Folorunso
2022-11-9
Perhaps as follows?
A=[2 3
4 5
10 7
15 9
16 12
17 18
19 20];
A=A';
B=A*0+[1;2];
[~,is]=sort(A(:));
B=cumprod(2*abs(diff(B(is))')-1) %result
Joshua Folorunso
2022-11-9
更多回答（2 个）
A=[2 3
4 5
10 7
15 9
16 12
17 18
19 20];
[As,is] = sort(A(:));
col = 1 + (is>size(A,1));
Vesign = 2*~~diff(col)-1;
Vesign = cumprod(Vesign);
Ves = string(Vesign);
Ves = repmat("+", size(Vesign));
Ves(Vesign<0) = "-";
S = As(1:end-1);
T = As(2:end);
col_S = col(1:end-1);
col_T = col(2:end);
T = table(S,T,col_S,col_T,Ves)
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