how to generate overlapping series

Dear

data of 30000x1.

want to make first packet of 2000 values

but in 2nd packet last 500 values from packet 1 repeat, means 2nd packet value start from 1500 and end at 3500.

3rd packet start at 3000 and end at 5000

till end of 30000.

How can i do it?

Answer 1

[Ioannis Andreou]

Try this

packages = nan(19, 2000);
for i = 1:19
   packages(i,:) = data((i-1)*1500+1: i*1500+500);
end

However there will be a few data left, less than 2000 though, so you cant fill a new package with them

[Ali Asghar]

Dear

I have two codes for overlapping windows, once yours and second code from other.

I run two codes on data and check result.

both code give right answer for 1st window only but give different answer for 2nd etc wondows which start from 1500 and end at 1500.

2 CODE

function segments_cell = overlap_window_segmentation(signal,windowSize,overlap,fs,rowNumber,filteredOrRaw)

%filteredOrRaw must be 1 for raw data and must be other numbers for filtered data.

colors=['r','g'];

%L=length(signal);

sz=size(signal);

if(sz(2)==1)

signal=signal';

end

sz=size(signal);

numberOfSegmentsEachRow=floor(sz(2)/(windowSize-overlap));

remaindar = mod(sz(2),(windowSize-overlap));

if remaindar < overlap

numberOfSegmentsEachRow=numberOfSegmentsEachRow-1;

end

save('numberOfSegmentsEachRow.mat','numberOfSegmentsEachRow');

total_number_of_segments=numberOfSegmentsEachRow*sz(1);

%segments = NET.createArray('System.Double[]',total_number_of_segments);

segments = zeros(total_number_of_segments,windowSize);

maxSignal= max(signal(rowNumber,:));

t=(1:length(signal(rowNumber,:)))/fs;

figure

plot(t,signal(rowNumber,:));hold on,

i=0;

j=1;

hight=[maxSignal 0.8*maxSignal];

for k=1:sz(1)

start=1;

L=length(signal(k,:));

while(start+windowSize-1 <= L && j <= total_number_of_segments)

%segments(j)=signal(k,start:start+windowSize-1);

segments(j,:)=signal(k,start:start+windowSize-1);

if(k==1)

plot([start start]/fs ,[hight(i+1) -0.5*maxSignal],colors(i+1));hold on,

plot([start+windowSize-1 start+windowSize-1]/fs ,[hight(i+1) -0.5*maxSignal],colors(i+1));hold on,

plot([start start+windowSize-1]/fs, [hight(i+1) hight(i+1)],colors(i+1));

end

start=start+windowSize-1-overlap;

i=~i;

j=j+1;

end

end

if(filteredOrRaw==1)

title('Overlap window segmentation for raw data');

else

title('Overlap window segmentation for filtered data');

end

xlabel('Time (s)');

ylabel('Amplituse');

%segments_cell=cell(segments);

segments_cell=segments;