How to access elements of all field of structure in same loop

Hi,

I defined structure and want to access elements of each feild. I use the below code and it giving error.

%%

close all
clear all
clc
student.name = 'Mekala';
student.age = 2;
student(2).name = 'Punith';
student(2).age = 6;

for i =1:length(student)
    name{i} = student{i}.name
end
%% Error: Cell contents reference from a non-cell array object.
for i =1:length(student)
    name(i) = student(i).name
end
%% Error: Subscripted assignment dimension mismatch.

for i =1:length(student)
    age(i) = student(i).age
end
%% This works.

How to access the all field values in the same loop?

[Stephen Cobeldick]

https://www.mathworks.com/help/matlab/matlab_prog/access-multiple-elements-of-a-nonscalar-struct-array.html

As Ameer Hamza wrote, there are simpler ways thatn using a loop:

https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html

https://www.mathworks.com/matlabcentral/answers/320713-how-to-operate-on-comma-separated-lists

Answer 1

[Ameer Hamza]

To access name filed, the following for-loop works

for i =1:length(student)
    name{i} = student(i).name
end

However, for-loop is not needed, and there are other easy ways to create an array of all elements of the struct array. Try following code

student.name = 'Mekala';
student.age = 2;
student(2).name = 'Punith';
student(2).age = 6;

name = {student.name};
age = [student.age];

[Mekala balaji]

for loop is for a big structure, can't we access all the fields in same loop?

[Ameer Hamza]

Do you want to automatically create variables with the same name as fields in the structs? If yes, then such practice is highly non-recommended: https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval. I will create slow and buggy code. If you want to extract all the fields, then I suggest you continue to work with the struct, as the code will be much more efficient and easy to debug.