length(fin​d((XM(2:en​d)>126.5 & XM(1:end-1)<126.5)｜ (XM(2:end)<126.5 & XM(1:end-1)>126.5)));

Can anyone tell me if in this function the terms XM (2: end) and XM (1: end-1) indicate two successive elements of the vector ?. If so, why? thank you in advance

Answer 1

[KALYAN ACHARJYA]

It represent the total elements in the vector (Except First One)

XM(2:end)

It represent the total elements in the vector (Except last one)

XM(1:end-1)

Indicate two successive elements of the vector (Multiple ways)

XM(1:2)
XM(i:i+1)
XM(end-1:end)
.....

Answer 2

[KSSV]

They represent second to last and first to last but one elements respectively.

% Example

a = rand(5,1) ;
a

a = 5×1

0.9264 0.3197 0.4573 0.7790 0.4464

[a(2:end) a(1:end-1)]

ans = 4×2

0.3197 0.9264 0.4573 0.3197 0.7790 0.4573 0.4464 0.7790

If you want sucessive elements, it should be

[a(1) a(2)]
[a(4) a(5)]

i,e, a(i) and a(i+1)