How to use a loop to find a sum and average?

Question

Mark Dillon 2015-7-11

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/229518-how-to-use-a-loop-to-find-a-sum-and-average

回答： Image Analyst 2015-7-11

I am learning how to use MATLAB and have been told there is a way to create a loop that will also output the sum and the average. What I have done so far is to create an array of a random sort of numbers and printed out each element as shown below:

% Variables
x = [1.8 3.6 5.4 7.2];
fprintf('x =');
disp(x);
% For Loop
for k = 1:length(x);
    fprintf('Element %0.0f is: %0.1f \n', k, x(k));
end

What I need to figure out next is how to use the 'for' loop to also print out the sum and average.

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Answer 1

Image Analyst 2015-7-11

4
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/229518-how-to-use-a-loop-to-find-a-sum-and-average#answer_185788

在 MATLAB Online 中打开

Try this:

% Variables
x = [1.8 3.6 5.4 7.2]
% For Loop
theSum = 0; % Initialize
for k = 1 : length(x);
  fprintf('Element %d is: %0.1f \n', k, x(k));
  % Accumulate the sum
  theSum = theSum + x(k);
  % Compute the running mean and print out.
  fprintf('After element #%d, the sum = %.1f, and the mean = %.3f\n\n',...
    k, theSum, theSum/k);
end