Creating an array of sums of another array.

I have an array of 322,872 data points. I want to create another array of the sum of the numbers in the first array in segments of 730 data points (sum from 1 to 730 would be the first point in the new array, sum from 731 to 1,460 would be the second point in the new array and so on). The code I have right now (which is not working) is the following:

i = 1;

j = 730;

while j < 322871;

i = i + 730;

j = j + 730;

k = 1;

x = zeros(442,1);

while k < 441;

x(k,:) = sum(WS_50mCopy(i:j,:));

end

end

Answer 1

[TADA]

n = 18; %n = 322872 in your case
windowSize = 5;% n = 730 in your case

% generate vector of size n
x = round(rand(1,n) * 100)

lastWindowSize = mod(n, windowSize);

% reshape x to a matrix of the wanted window size
x1 = reshape([x zeros(1, windowSize - lastWindowSize)], windowSize, (n + windowSize - lastWindowSize)/windowSize)

% sum each column of the matrix to generate the sums vector
y = sum(x1, 1)

These are the vectors that were generated:

x =

    60    47    70    70    64     3     7    32    53    65    41    82    72    97    53    33    11    61


x1 =

    60     3    41    33
    47     7    82    11
    70    32    72    61
    70    53    97     0
    64    65    53     0


y =

   311   160   345   105