How to calculate the average between each two adjacent members(rows or columns)?

Hi All

I have an array like

a= [1 2 3 4 5]

and I need the average between two members and add it to a new array

av= [1.5, 2.5, 3.5, 4.5]

which will have one les member obviously

Answer 1

[Tommy]

Try this:

>> a= [1 2 3 4 5];
b = (a(1:end-1) + a(2:end))/2

b =

    1.5000    2.5000    3.5000    4.5000

[Deepak Gupta]

other methods:

1.

a= [1 2 3 4 5];
b = mean([a(1:end-1); a(2:end)]);

2.

a= [1 2 3 4 5];
b = 0.5 * (a(1:end-1) + a(2:end));

3.

a= [1 2 3 4 5];
temp = 0.5*conv([1 1], a);
b = temp(2:end-1);

Answer 2

[Saurav Roy]

Hey,

Try this for the Row and adjust accordingly for the columns.

arr = [1 2 3 4 5];

len = length(arr);

arr_secondary = [];

for i = 1:len-1

primarynum = arr(i);

secondarynum = arr(i+1);

avgnum = (primarynum + secondarynum)/2;

arr_secondary(i) = avgnum;

end

disp(arr_secondary);

[farzad]

thank you very much