Filtering the data according to the time stamp

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ASMS Mat Su
ASMS Mat Su 2011-11-20
I would like to filter this data according to the time stamp i.e for the first three second of the time, and take average of Elevation and Speed at 0, 1, 2 and 3 sec.
OR take average for the first three second each time, and return one mean value for each parameters.
What is the appropriate function?
Anyone expert on this?
Let say matrix of A =
Time, s Elevation Speed
0 23.9 0.28
0 23.9 0.28
0 23.9 0.28
0 23.9 0.28
1 23.9 0.28
1 23.9 0.28
1 24.7 0.28
1 24.7 0.28
1 24.7 0.28
1 24.7 0.28
2 24.7 0.28
2 24.7 0.28
2 24.7 0.44
2 24.7 0.44
3 23.1 0.44
3 23.1 0.44
3 23.1 0.44
3 23.1 0.44
3 23.1 0.44
3 23.1 0.44

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回答（1 个）

Kostas
Kostas 2011-11-20
Sure not the most "efficient" solution but could work smt like that
k=0;
for i=0:3 % loop over the seconds
id=find(A(:,1)==i); %get indices where you find the time you want
if ~isempty(id)
k=k+1;
elev_mean=mean(A(id,2)); %mean value of parameter elevation
s_mean=mean(A(id,3)); %mean value of parameter time
m_values(k,:)=[i elev_mean s_mean];
end
end
  1 个评论
ASMS Mat Su
ASMS Mat Su 2011-11-28
Thanks Kostas;
Its not working...How about this...
n = 5; % Number of filtered data
t = max (A(:,1)); % max total Time,s
k=1;
for i=0:t; % Loops for time t=0 to t=Max
ind = find(A(:,1)==i);
X = EC(ind(1:n),1:3);
disp (X);
Y = mean(A(ind(1:n),2:4));
k=k+1;
end
but then I have another problem! I want to get every single X stored e.g for the first 2 row at t=0,1,2,3...

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