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How to calculate moving average

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Mekala balaji
Mekala balaji 2017 年 11 月 16 日
編集済み: dpb 2020 年 11 月 25 日
Hi,
I have following data:
0.10
0.24
0.30
0.25
0.33
0.35
0.46
0.47
0.48
0.51
0.52
0.53
0.53
0.57
0.58
0.58
0.58
0.59
0.63
0.64
0.66
0.72
I want to take 3-points moving average,
Please help some one
  2 件のコメント
Quin Silk
Quin Silk 2019 年 12 月 11 日
Can someone write code to do it without using movmean?
Star Strider
Star Strider 2019 年 12 月 11 日
@Quin Silk — See the Moving Average Filter link in my Answer.

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回答 (6 件)

Bandar
Bandar 2019 年 12 月 11 日
Take a look this data
file=[1 2 3 4];
movmean(file,3)
which returns
1.5000 2.0000 3.0000 3.5000
The filter works as follows:
1 2 (1+2)/2 = 1.5 when k points at 1
1 2 3 (1+2+3)/3 = 2.0 when k points at 2
2 3 4 (2+3+4)/3 = 3.0 when k points at 3
3 4 (3+4)/2 = 3.5 when k points at 4
Now it is easy to convert it to a logical code or merely use movmean().
  3 件のコメント
Bandar
Bandar 2019 年 12 月 11 日
A=[1 2 3 4 5 6];
m=ones(1,length(A));
for i=1:length(A)
if i == 1
m(i) = (A(i)+A(i+1))/2;
elseif i == length(A)
m(i) = (A(i-1)+A(i))/2;
else
m(i) = (A(i-1)+A(i)+A(i+1))/3;
end
end
movmean(A,3)
m
Micheal Omojola
Micheal Omojola 2020 年 9 月 8 日
@Bandar Aldhafeeri: Thank you! Your answer was helpful.

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KL
KL 2017 年 11 月 16 日
If you have 2016b or later, use movmean,
mean_arr = movmean(your_array,3)

Star Strider
Star Strider 2017 年 11 月 16 日
Use the movmean (link) function (introduced in R2016a).
You can also use the filter function. See the section on Moving-Average Filter (link).
  1 件のコメント
Pallavi Bharati
Pallavi Bharati 2020 年 11 月 25 日
How to do centered moving average ...three point centred moving average in matlab without the movmean command as i have matlab 2015

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dpb
dpb 2017 年 11 月 16 日

Sudhakar Rayabarapu
Sudhakar Rayabarapu 2018 年 9 月 8 日
編集済み: Sudhakar Rayabarapu 2018 年 9 月 8 日
Name your data array A; and keep as a column; then use this command
OutPut = tsmovavg(A, 's', 3, 1)
this will give you the simple moving average

Pallavi Bharati
Pallavi Bharati 2020 年 11 月 24 日
Can anyone help me to compute three point moving average of a 5 year data.I used the filter command but the result are erroneous .I am using MATLAB 2015.And I have a huge data 5 year day wise data and i have to compute three point moving average for each month .
  2 件のコメント
Pallavi Bharati
Pallavi Bharati 2020 年 11 月 24 日
Using looping can be erroneous for so large data please suggest something else
dpb
dpb 2020 年 11 月 24 日
編集済み: dpb 2020 年 11 月 25 日
The results aren't "erroneous" (presuming you defined the coefficients correctly), they just depend on how one treats the end conditions...examine the following:
>> x=1:10;
>> movmean(x,3)
ans =
1.5000 2.0000 3.0000 4.0000 5.0000 6.0000 7.0000 8.0000 9.0000 9.5000
>> filter(ones(1,3)/3,1,x)
ans =
0.3333 1.0000 2.0000 3.0000 4.0000 5.0000 6.0000 7.0000 8.0000 9.0000
>> conv(x,ones(1,3)/3,'same')
ans =
1.0000 2.0000 3.0000 4.0000 5.0000 6.0000 7.0000 8.0000 9.0000 6.3333
>> conv(x,ones(1,3)/3,'valid')
ans =
2.0000 3.0000 4.0000 5.0000 6.0000 7.0000 8.0000 9.0000
>>
movmean special-cases the end positions to change the divisor to match the number of elements from 2:N on each end; filter and conv do not.
It's up to you to determine the solution you wish to use; none is theoretically any more or less correct than any other; just different assumptions are made.

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