How to access the subfield of the variable(field type) stored in the array

Question

Nathan 2012-9-26

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Hi guys, I have a little tricky prob :

I have several field type variable in the workspace and I stored them in an array using the code as :

A = whos ('*')
A(1) 
ans = 
          name: 'x_bacyen'
          size: [1 1]
         bytes: 308814
         class: 'struct'
        global: 0
        sparse: 0
       complex: 0
       nesting: [1x1 struct]
    persistent: 0

However, since each element in the array is in fact a field variable, how can I access the subfield of each element？ I tried something like this :

A(1).name.signal.value   % I want to make it work as call variable x_bacyen.signal.value

but it doesn't work.. anyway to realize it ?

I will really appreciate it if anyone can give me a hint. thx!

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Answer 1

Matt Fig 2012-9-26

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编辑：Matt Fig 2012-9-26

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This is not the way to store them in a structure. Instead you could do this:

save('myvars')
clear
A = load('myvars')

Now if you want to get the fieldnames so you can index into the variables, just do:

F = fieldnames(A);
A.(F{1}).signal.value

.

For a complete example, this works:

clear all,clc
S.r = 5;
S.malk = magic(3);
B.reff = ones(1,3);
B.help.file = 'myfile';
S.next.step = 8;
save('myvars')
clear all
A = load('myvars')
A.(F{2}).help.file  % B.help.file
A.(F{1}).malk       % S.malk

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Nathan 2012-9-26

Great, it works exactly as I want it to....thx very much !!

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Answer 2

Thomas 2012-9-26

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编辑：Thomas 2012-9-26

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You could try a new variable as newstring.. I'm still not clear as to why you would want to create a new variable from the value of output of a structure..

newstring=strcat(A(1).name,'.signal.value')

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Nathan 2012-9-26

becoz i want to realize a loop by calling something like 'A(i).name.signal.value ' in order access the value of each field variable repeatedly .. thx anyway ~　：）

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