How to read specific fields from multiple structure arrays in MATLAB?

Jay
2013 2 20
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Hello,
I have a very large dataset arranged into multiple structure arrays in MATLAB. The structures look something like this:
Flight1=
.testpoint = 1
.Mach = 0.8
.Speed = 300
.Cieling = 35000
.Data = [A] % A is an MxN matrix
Similarly there are multiple test points for multiple flights. Is there a way to retrieve the Data of only specified test points? For example I want to plot and compare the Data of ALL the test points whose .Mach = 0.8 or where .testpoint = 2?
I hope I have made it clear enough.

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Azzi Abdelmalek
Azzi Abdelmalek 2013-2-20
编辑：Azzi Abdelmalek 2013-2-20

0 个投票

idx=cellfun(@(x,y) x==2 |y==0.8,{Flight1.testpoint},{Flight1.match})
%idx is the index that fit your conditions

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Jay
Jay 2013-2-20
Thanks, but this applies to Flight1 data only. I have a directory which includes structure arrays for Flight1, Flight2,...,Flight5 and each of these contains at least 10 substructures (testpoints). I would like to scan the directory and plot the Data for the 2nd test point of each Flight.
Azzi Abdelmalek
Azzi Abdelmalek 2013-2-20
编辑：Azzi Abdelmalek 2013-2-20
Your directory can't contain struct variables, but files! How are those variables stored? Unless they are stored in mat files with same names as variables
Jay
Jay 2013-2-20
yes they are stored in mat files (eg. Flight1.mat)
Azzi Abdelmalek
Azzi Abdelmalek 2013-2-20
编辑：Azzi Abdelmalek 2013-2-20
for k=1:10
s=sprintf('Flight%d',k)
Flight1=load(s)
idx=cellfun(@(x,y) x==2 |y==0.8,{Flight1.testpoint},{Flight1.match})
out=Flight1(idx)
v{k}={out.testpoint}
end

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