Accessing the string elements

109 views (last 30 days)
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
What am I doing wrong? Any help will be highly appreciated.
Stephen23 on 17 Oct 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:

Sign in to comment.

Accepted Answer

Cedric Wannaz
Cedric Wannaz on 17 Oct 2017
Edited: Cedric Wannaz on 17 Oct 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) ;
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} ) ;
Cedric Wannaz
Cedric Wannaz on 17 Oct 2017
Awesome. Thank you for the positive feedback!

Sign in to comment.

More Answers (0)


Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by