Help doing the average between successive (1,2) cells of two different arrays?

Hi! I have a (250,2) array and i divide that array in two array: one contains the even rows and the other the odd rows. Those coordinates are points and i want to find the mid point of those two points(the odd one and the even one, between 1 and 2, then between 2 and 3, then between 3 and 4, and so on...) Is there a way to do this?

Thank you very much

Answer 1

[Image Analyst]

Try this:

a = rand(250, 2); % Sample data
% Make kernel to do the averaging.
kernel = [1;1]/2;
% Make every row of b the average or two adjacent rows of a.
b = conv2(a, kernel, 'valid')

It give you exactly what you're asking for. With your example data:

a =
     4     3
     2     2
     3     3
     4     2
b =
                         3                       2.5
                       2.5                       2.5
                       3.5                       2.5

Answer 2

[Azzi Abdelmalek]

a=rand(250,2)
a1=a(1:2:end,:);
a2=a(2:2:end,:);
b=(a2+a1)/2

[Jacob]

Thats not the average im looking for. Sorry for being a bit annoying but i need some help. Could you read again the problem?

 There are N number of panels. The points connecting the panels are p1 for the odd 2D points (1,3,5...) and p2 for the even 2D points(2,4,6...). I need to find p, 250 points, which are the centerpoints of the panels, the center of the p1 and p2. Find below an example:

p(1,:)=(p1(1,:)+p2(2,:))/2

p(2,:)=(p1(3,:)+p2(2,:))/2

p(3,:)=(p1(3,:)+p2(4,:))/2

p(4,:)=(p1(5,:)+p2(4,:))/2

p(5,:)=(p1(5,:)+p2(6,:))/2

up to

p(250,:)=(p1(249,:)+p2(250,:))/2

[Azzi Abdelmalek]

This is not clear, give a short numeric example, for example 8x2 array

[Jacob]

clc
clear
a=ceil(4*rand(4,2))
a1=a(1:2:end,:)
a2=a(2:2:end,:)
b(1,:)=(a(1,:)+a(2,:))/2;
b(2,:)=(a(3,:)+a(2,:))/2;
b(3,:)=(a(3,:)+a(4,:))/2

Output=
a= 4     3
   2     2
   3     3
   4     2

a1 =4     3
    3     3

 a2=2     2
    4     2

b = 3.0000    2.5000
    2.5000    2.5000
    3.5000    2.5000

Which is exactly what I need but i need a formula to extend this to 250 rows(panels with 251 points connecting them)

[Azzi Abdelmalek]

I think you need this

a =[ 4     3
     2     2
     3     3
     4     2]
a1=a(1:end-1,:)
a2=a(2:end,:,:)
b=(a1+a2)/2