Eliminating unnecessary portions of arrays from structure.

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!

[James Tursa]

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

Answer 1

[Fabio Freschi]

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

[bio lim]

This only works if you want only 290<IAS<310 for all arrays, which is not in my case.