How can I store values from loops in a vector?

If I have a column of 50 rows and I want to store in a new vector the sum of first to third row, then second to fourth, etc.. how could be the code? thanks in advance

Answer 1

[turquoise_squid]

reshape the vector with the command 'reshape' to a n x m matrix and perform the mean on its rows.

[Philippe Corner]

Thats a good idea, Ill try it out! thanks

Answer 2

[Steven Lord]

Use the movsum function.

[Philippe Corner]

Excelent function, thanks a lot!

[Philippe Corner]

Hey bud, this is the code im using:

if true
  % code
end
clear all
[P1,P2,P3,P4] = textread('Octubre207.txt','%f %f %f %f','delimiter',';');
P3(P3 == -999) = 0;
A=reshape(P3,1440,31);
S=sum(A)';
movsum(A,31,3)

And command windows shows: Undefined function or variable 'movsum'. do you know what's the mistake?

[Image Analyst]

It's only in R2016a or later.

Answer 3

[Image Analyst]

Try conv():

data = rand (50, 1);  Sample data.
kernel = [1;1;1]/3; % Kernel to computer the mean of 3.
movingMeans = conv(data, kernel, 'valid') % Mean of 1-3, 2-4, 3-5, etc.