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

2014 3 30
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更新时间：2014 3 30
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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

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Image Analyst
Image Analyst 2014-3-30
编辑：Image Analyst 2014-3-30

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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

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Azzi Abdelmalek
Azzi Abdelmalek 2014-3-30
编辑：Azzi Abdelmalek 2014-3-30

0 个投票

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

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Jacob
Jacob 2014-3-30
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
Azzi Abdelmalek 2014-3-30
编辑：Azzi Abdelmalek 2014-3-30
This is not clear, give a short numeric example, for example 8x2 array
Jacob
Jacob 2014-3-30
编辑：Azzi Abdelmalek 2014-3-30
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
Azzi Abdelmalek 2014-3-30
编辑：Azzi Abdelmalek 2014-3-30
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

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