Accessing the string elements

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pradeep kumar
pradeep kumar il 17 Ott 2017
Modificato: Cedric il 17 Ott 2017
I have 3 strings like the following:
world=["America", "Europe"]; % Parent String
America=["USA", "Brazil", "Argentina"]; % Child1 String
Europe=["France", "Germany", "England"]; % Child2 String
I want to access the elements of the child string (Country names) from the Parent string(world) and use it inside a for loop for further operation. I am trying in the following way:
for i=1:2
d=world(i); % Temporary variable to store the continent name
for j=1:3
disp(d(j)); % Throws an Error: "Index exceeds Matrix dimensions
end
end
What am I doing wrong? Any help will be highly appreciated.
  2 Commenti
KL
KL il 17 Ott 2017
You're defining three entirely different variables. Where and how do you want to apply this?
Stephen23
Stephen23 il 17 Ott 2017
The simplest and most efficient solution is to use structures and dynamic fields:
Do not try to magically access variable names. Doing so will make your code slow, complex, buggy, hard to debug, inscure. Read this to know why:

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Cedric
Cedric il 17 Ott 2017
Modificato: Cedric il 17 Ott 2017
Here is one way, as string arrays are "iterable".
continents = ["America", "Europe"] ;
countries.America = ["USA", "Brazil", "Argentina"] ;
countries.Europe = ["France", "Germany", "England"] ;
for continent = continents
fprintf('%s :\n', continent ) ;
for country = countries.(continent)
fprintf('\t%s\n', country) ;
end
end
Yet, using dynamic field names for that is usually not advised. You could use cell arrays instead:
continents = {"America", "Europe"} ;
countries{1} = {"USA", "Brazil", "Argentina"} ;
countries{2} = {"France", "Germany", "England"} ;
for continentId = 1 : numel( continents )
fprintf('%s :\n', continents{continentId} ) ;
for countryId = 1 : numel( countries{continentId} )
fprintf('\t%s\n', countries{continentId}{countryId} ) ;
end
end
  9 Commenti
pradeep kumar
pradeep kumar il 17 Ott 2017
Cedric, The above solution works perfect. I am using MATLAB 2017a. You are genius. Thanks a lot. I hope, You were my TEACHER here.
Cedric
Cedric il 17 Ott 2017
Modificato: Cedric il 17 Ott 2017
Awesome. Thank you for the positive feedback!

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