Averaging the selected vector ranges

Question

Lev Mihailov 2020-11-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/638850-averaging-the-selected-vector-ranges

评论： Mathieu NOE 2020-11-9

Hello! I need to average the values of a vector over 25 values

fr = mean(reshape(VectorTime, 25, [])); % 
Error using reshape
Product of known dimensions, 25, not divisible into total number of elements, 523.
Error in TimeAndWordNN (line 1234)
frr = mean(reshape(VectorTime, 25, []));

When I try to make such a variant, I get an error, please help

for i=1:25:length(VectorTime) && i<length(VectorTime) 
    frr=mean(VectorTime(i:i+1))  % i(1)=1 i(2)=26 
end
% tried what i need to do through the loop but nothing worked

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Answer 1

Mathieu NOE 2020-11-6

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/638850-averaging-the-selected-vector-ranges#answer_536590

在 MATLAB Online 中打开

myslidingavg.m

hello

my 2 fold suggestion , first is new code according to your expected results , and second is based on sliding averaging - function is in attachement !

enjoy

samples = 1000;
VectorTime = 1 + sin(2*pi*(1:samples)/samples)+ 0.25*rand(1,samples);
buffer = 25;    % nb of samples for averaging 
% zero overlap mean averaging
for ci=1:floor(length(VectorTime)/ buffer)
    start_index = 1+(ci-1)*buffer;
    stop_index = min(start_index+ buffer,length(VectorTime));
    time_index(ci) = round((start_index+stop_index)/2);
    frr(ci) =mean(VectorTime(start_index:stop_index))  % 
end
figure(1),
plot((1:samples),VectorTime,'b',time_index,frr,'or');
% sliding avg method
out = myslidingavg(VectorTime, buffer);
figure(2),
plot((1:samples),VectorTime,'b',(1:samples),out,'r');