MATLAB: Access automatically substructures from loop

automatic;for loopiterationloopmatricesstructures

Good morning everybody, I hope everything is good for you,

I am working with large structures and I want to automatize some tasks. If we take the structure that I attached to this message, how do I select the nth matrix of the structure ? Without writing "Example.hello" ?

I would like to do the same as when we take the value of a matrix in the nth position ( matrix(n)).

Have a nice day

Best Answer

Rather than depending on the order in which the fields of the struct array are displayed (which can change -- in the following example s and snew contain the same data just in a different order)

s = struct('b',2,'c',3,'a',1)
snew = orderfields(s)

I would use dynamic field names, potentially in conjunction with the fieldnames function, or maybe (if you want to iterate through all the fields of the struct) structfun.

fn = 'b';
b1 = s.(fn)
b2 = snew.(fn)
sSquared = structfun(@(x) x.^2, s)

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Although there is a MATLAB function to do this, but it is a very bad practice to name your variables like this. It will make your code error prone and hard to debug. Therefore I am going to suggest the correct way to solve the problem. You should create a struct array and store the input number as a field of the struct. For example

for ii=1:10
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It will take 10 inputs from user and store them in struct array.

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mask = [vel.y] <= 20;
result.vel_sub1 = vel(mask) ;
result.vel_sub2 = vel(~mask) ;

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