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acces data in struct

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Rica
Rica el 19 de Jul. de 2019
Comentada: Mario Chiappelli el 19 de Jul. de 2019
Hi!
I have a struct Str. the element of the structure arle A, B, C,.... all of the are arrays with length 2000. I want to have onle the element from 500:1500 without writing
Str.A1=Str.A(500:1500) for every struct element.
is there an easy way to achieve this goal?
thank you!

Respuesta aceptada

Peter Jarosi
Peter Jarosi el 19 de Jul. de 2019
Editada: Peter Jarosi el 19 de Jul. de 2019
You can use for loop indexing elements of your structure:
myElements = fieldnames(Str);
% or you can list your elements
% myElements = {'A', 'B', 'C'};
for x = 1 : length(myElements)
e1 = myElements{x};
e2 = strcat(e1, '1');
Str.(e1)=Str.(e2)(500:1500);
end
Please, let me know if it works for you
  2 comentarios
Rica
Rica el 19 de Jul. de 2019
it works! but you should change this:
e2 = strcat(e1);
Thank you!
Peter Jarosi
Peter Jarosi el 19 de Jul. de 2019
Editada: Peter Jarosi el 19 de Jul. de 2019
You're very welcome!
You are right, if you want to overwrite your existing instances. In this case strcat() is even unnecessary:
myElements = fieldnames(Str);
% or you can list your elements
% myElements = {'A', 'B', 'C'};
for x = 1 : length(myElements)
e1 = myElements{x};
Str.(e1)=Str.(e1)(500:1500);
end
but in your question you wrote:
Str.A1=Str.A(500:1500);
that's why I thought that you want to create new elements of your structure in order to save old ones.

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Más respuestas (2)

Mario Chiappelli
Mario Chiappelli el 19 de Jul. de 2019
Editada: Mario Chiappelli el 19 de Jul. de 2019
I would loop through each A,B,C... Other languages call this a for each loop.
for str = {'A','B','C'}
variableName = strcat(str{1},'1');
Str.(variableName) = Str.(str{1})(500:1500);
end
Note: Instead of looping through numbers where each iteration is stored in the for statement variable "i" (or whatever you decide to call it), you are looping through each letter and the for statement variable in this case is "str".
  6 comentarios
Peter Jarosi
Peter Jarosi el 19 de Jul. de 2019
Good job! I've given you a vote for it.
One little thing is left. Change "1" to '1'
Mario Chiappelli
Mario Chiappelli el 19 de Jul. de 2019
*thumbs up emoji

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Rica
Rica el 19 de Jul. de 2019
Thank you to every one!

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