# How to flip an ordered X-axis that is half half separated for data?

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Dorna on 3 Jun 2023
Edited: Star Strider on 4 Jun 2023
Hi, I have a plot that I want its X-axis to be reversed. My data on X-axis is showing as
[1 2 3 4 5 6 7 8 9 10 11 12] I want to reverse it in a way that it represents [6 5 4 3 2 1 12 11 10 9 8 7] (reversing it from the middle for two seperate parts). How is it possible? I tried set(gca, 'XDir','reverse') but it reverses it to [12 11 10 9 8 7 6 5 4 3 2 1]. I cannot share the code or data due to confidentiality. Thanks in advance.

Dorna on 4 Jun 2023
Ok, so what I needed to do was
A = Data((1:20),(1:5))
B = flip(A,1)
C = Data((21:40),(1:5))
D = flip(C,1)
And then
New = cat(1,B,D)
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Star Strider on 4 Jun 2023
Edited: Star Strider on 4 Jun 2023
O.K.
That seems to be essentially what I wrote, although in one column not five. You can use my approach to plot it.

### More Answers (2)

VBBV on 3 Jun 2023
Use xticklabels function to modify the order of axis labels
x1 = {'6','5','4','3','2','1'};
x2 ={'12','11','10','9','8','7'};
plot(rand(1,12))
xticks(1:12)
xticklabels([x1,x2])
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VBBV on 3 Jun 2023
Edited: VBBV on 3 Jun 2023
can you explain why you DONT want to actually work with plot data but still want to flip ordered x-axis values ?
v = [16 5 9 4 2 11 7 14];
v2 = v([5:8 1:4]) % Extract and swap the halves of v
v2 = 1×8
2 11 7 14 16 5 9 4
% flip the values for vector v
v2 = flip(v)
v2 = 1×8
14 7 11 2 4 9 5 16
% another way
v2 = v([8:-1:5 , 4:-1:1])
v2 = 1×8
14 7 11 2 4 9 5 16
How can I make the V2 to be [14 7 11 2 4 9 5 16], can I use prime on 5:8'?
You can use the flip function to get the desired result as shown above

Star Strider on 3 Jun 2023
One approach that changes the x-axis and the data —
xv = [1 2 3 4 5 6 7 8 9 10 11 12]; % Independent Variable
yv = (xv/max(xv)).^2; % Dependent Variable
xvi = [6 5 4 3 2 1 12 11 10 9 8 7]; % Indexing Vector
figure
plot(xv, yv)
grid
xticks(xv)
title('Original')
Vectors = [xv(xvi); yv(xvi)]
Vectors = 2×12
6.0000 5.0000 4.0000 3.0000 2.0000 1.0000 12.0000 11.0000 10.0000 9.0000 8.0000 7.0000 0.2500 0.1736 0.1111 0.0625 0.0278 0.0069 1.0000 0.8403 0.6944 0.5625 0.4444 0.3403
figure
plot(xv, yv(xvi))
grid
xticks(xv)
xticklabels(xv(xvi))
title('Reversed & Concatenated')
It may be challenging to elliminate the connecting line between 1 and 12 here. If necessary, that would require putting a NaN value at the beginning or end of the ‘xv’ and ‘yv’ vectors, and adjusting ‘xvi’ accordingly.
.
Dorna on 4 Jun 2023
I wish there was an easier alternative to the solution that I posted.

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