Question regarding loop with multiple string comparisons?
2 views (last 30 days)
Show older comments
Hello. I am trying to extract several Aircraft data from a general data I have. I want the following 6 aircraft data from my general structure data. If it were for only 1 aircraft type, it works fine. However, for several aircraft, it doesn't. I am using a method such that my field 'type' matches the aircraft types and extract those data. If I use & instead of |, it also doesn't work. ( I believe it suggests that both conditions must be satisfied if I use '&' which doesn't make sense since each array has only 1 type.)
idx_plane = false(length(data2),1);
for p = 1 : length(data2) % 1574
if strcmp(data2(p).type, 'A319') | strcmp(data2(p).type, 'A318') | strcmp(data2(p).type, 'B788') | strcmp(data2(p).type, 'A320') | strcmp(data2(p).type, 'A321') | strcmp(data2(p).type, 'A330')
idx_plane(p) = true;
end
end
data2 = data2(idx_plane);
3 Comments
the cyclist
on 30 Jun 2015
Perhaps an even neater way to define the index:
idx_plane = ismember({data2.type},{'A319', 'A318', 'B788', 'A320', 'A321', 'A330'});
Accepted Answer
the cyclist
on 30 Jun 2015
I created some made-up data, and ran your code:
data2(1).type = 'A318';
data2(2).type = 'A319';
data2(3).type = 'B318';
data2(4).type = 'B319';
data2(5).type = 'C318';
data2(6).type = 'C319';
data2(7).type = 'D318';
data2(8).type = 'D319';
idx_plane = false(length(data2),1);
for p = 1 : length(data2) % 1574
if strcmp(data2(p).type, 'A319') | strcmp(data2(p).type, 'A318') | strcmp(data2(p).type, 'B788') | strcmp(data2(p).type, 'A320') | strcmp(data2(p).type, 'A321') | strcmp(data2(p).type, 'A330')
idx_plane(p) = true;
end
end
data2 = data2(idx_plane);
It behaved as I expected. I end up with a 1x2 struct, with only the A318 and A319 types.
More Answers (0)
See Also
Categories
Find more on Matrix Indexing in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!