Moving window of 100 points with 20 points overlap.
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davit petraasya
am 15 Feb. 2016
Kommentiert: Image Analyst
am 16 Feb. 2016
Hi everybody
I have around 500 points. My x axis-times, y-magnitudes. I need to do plot moving window of 100 points averages with 20 point overlap over time. How I may do the plot? I attached something sample plot also. (Please see my code and excel file, I need to continue my this code ...
[NUMERIC,TXT,RAW]=XLSREAD('sihex.xlsx');
A= -0.59;
B = 43.45;
C=0.09;
x=NUMERIC(:,2);
y=NUMERIC(:,1);
Mag=NUMERIC(:,3);
for iii=1:length(TXT);
date_str(iii,:)=TXT(iii,1);
end
date_num=datenum(date_str,'dd/mm/yyyy');
condition11=(Mag >= 0.8 & x > A-C & x < A+C & y > B-C & y < B+C);
plot(date_num(condition11),Mag(condition11),'.b');
datetick('x','yyyy','keeplimits'))
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Akzeptierte Antwort
dpb
am 15 Feb. 2016
Nfilt=20;
b=ones(1,Nfilt)/Nfilt; % weights
magFiltered=[nan filter(b,1,mag)]; % weight average (includes end effects)
magFiltered(2:nFilt-1)=nan; % replace end effects w/ NaN keeping time location
3 Kommentare
dpb
am 15 Feb. 2016
I've no klew what the "100 events" means, the above is a moving average of nPoints.
Oh, rereading I missed part of the request...no, the above doesn't do the "jump", it's a step increment of unity. As IA says, use either blockproc or conv instead.
Weitere Antworten (1)
Image Analyst
am 15 Feb. 2016
An alternate way is to use blockproc(), if you have the Image Processing Toolbox. It gives you control over the window size and the "jump" length.
Or, you could use conv() (which moves over one element at a time) and then just subsample every 20th element from the result.
2 Kommentare
Image Analyst
am 16 Feb. 2016
I've attached two demos where I use the function in a wide variety of ways. Adapt as needed. Good luck.
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