finding sub sequences of a data set

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Silpa K
Silpa K 2019-11-8
评论： Silpa K 2019-11-12
clc
clear
ts = xlsread('SwedishLeaf_TRAIN.xlsx');
l=length(ts);
for i = 1:500
p=ts(i,:)
for ii = 1:129
subSequence(ii,:) = p((ii-1)*30+ 1:ii*30);
end
I used the above code for finding the subsequences,but it not working.How can I find the subsequence of this.
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Star Strider
Star Strider 2019-11-8
You need to describe in detail what your data are, and what you want to do.
Silpa K
Silpa K 2019-11-8
I attached data set.I need to split each row.Each 30 points I need to separate from each row.

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回答（1 个）

Ajay Pattassery
Ajay Pattassery 2019-11-11
I assume you want to extract a sub-vector of length 30 from each row. But the total length of the column is 129 which is not divisible by 30. Hence the 5th sub-vector will take 21 elements from the second row and it goes on.
subsequence = (reshape(ts',30,[]))'
If you have a constraint to keep the column length 129 and wish to have sub-parts elements from the same row together, you could split the matrix into two parts. One exactly divisible by 30.
ts1 = ts(:,1:120);
Subsequence1 = (reshape(ts1',30,[]))';
Subsequence2 = ts(:,121:end);
Here Subsequence1 will be 2000x30 and Subsequence2 will have the remaining elements of each row.
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Walter Roberson
Walter Roberson 2019-11-12
buffer() from the signal processing toolbox is useful. But otherwise mat2cell()
L = length(Ts1);
BL = 30;
if mod(L, BL)
Sequences = cell2mat(Ts1, 1, [BL * ones(1, floor(L/BL)), mod(L,BL)]);
else
Sequences = cell2mat(Ts1, 1, BL * ones(1, floor(L/BL)));
end
Silpa K
Silpa K 2019-11-12
I used this in below code,Iam getting errors.Please help me
ts = xlsread('ArrowHead_TRAIN.xlsx');
l=length(ts);
for i = 1:24
p=ts(i,:)
fa = movstd(p,20,1);
secarray=movstd(fa,20,1) ;
k=maxk(secarray,10);
mpt=find(p);
mp=p(mpt(round(numel(mpt)/2)));
G=min(abs(mp-k));
[~,ii] = min(abs(p(:) - k(:)'));
out = p(unique(ii));
L = length(p);
BL = 30;
if mod(L, BL)
Sequences = cell2mat(p, 1, [BL * ones(1, floor(L/BL)), mod(L,BL)]);
else
Sequences = cell2mat(p, 1, BL * ones(1, floor(L/BL)));
end
A = [];
A = [];
for ii = 1:length(SubSequences)
if any(ismember(Subsequences,out))
if (k-mp<=G+l/2)
A{end+1} = Subsequences;
end
end
end
disp(aa);
Z=Subsequences;
idx = p(1:1);
q=[idx Z];
data = q;
cellReference = sprintf('A%d', i);
xlswrite('swetrain.xlsx', data, 1, cellReference);
end

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