Creating an array of sums of another array.

Question

Daniel Ring 2018-12-26

0
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https://ww2.mathworks.cn/matlabcentral/answers/437299-creating-an-array-of-sums-of-another-array

回答： TADA 2018-12-26

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

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Answer 1

TADA 2018-12-26

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https://ww2.mathworks.cn/matlabcentral/answers/437299-creating-an-array-of-sums-of-another-array#answer_354032

在 MATLAB Online 中打开

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 =
  47    70    70    64     3     7    32    53    65    41    82    72    97    53    33    11    61
x1 =
   3    41    33
   7    82    11
  32    72    61
  53    97     0
  65    53     0
y =
 160   345   105