Eliminating unnecessary portions of arrays from structure.

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bio lim
bio lim 2015-6-19
评论： bio lim 2015-6-21
Hello. I have 1x1574 structure array called "data" with 27 fields. I would like to perform on one of the fields, "IAS". I would like to only extract (take out) the near constant segment, and eliminate the rest. For example.
plot(data(1).Altitude, data(1).IAS)
I get the following graph.
I only want to take out the near constant segment, which is around 300 knots. (Range around plus and minus 10 knots) (From 2.4 * 10^4 to 3.2 * 10^4). When I extract this, I also want this to happen to the other fields.(In other words, I am only interested in the near constant segments of the IAS, and the others are not important).
Now I can do this one by one, but the problem is I have 1574 arrays which is too many. Could anyone help me? Thanks!
  1 个评论
James Tursa
James Tursa 2015-6-19
编辑：James Tursa 2015-6-19
To clarify, are you trying to do something like this pseudo-code?
for k=1:1574
range = find indexes for the beginning near-constant portion of data(k).IAS
f = fieldnames(data(k));
n = numel(f);
for m=1:n
Remove range from data(k).(f{m});
end
end

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Fabio Freschi
Fabio Freschi 2015-6-19
编辑：Fabio Freschi 2015-6-19
If I understand correctly you want something like this
idx = find(data(1).IAS >= 290 & data(1).IAS <= 310);
plot(data(1).Altitude(idx), data(1).IAS(idx));
Then you can use 'idx' to extract the desired values from other fields
data(1).something(idx)
Actually you can also use logical indexing removing 'find'.
Fabio

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