MATLAB: Compute the mean of a field in a struct

mean struct fields

Hello, I have an array of student structs. One of the fields is age. How can I compute the mean of ages in the array?

E.g. in my array I have

student(1,1).name = 'James';
student(1,1).lastname= 'Bond';
student(1,1).age= 19;
student(1,2).name = 'John';
student(1,2).lastname= 'Little';
student(1,2).age= 24;

As a result I expect the mean of the two ages, 31 (tks Matt Fig!)

Thanks!

Best Answer

The mean of 19 and 24 is not 33.5.

mean([student.age])

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Instead of indexing within an array stored in a structure element, I sorted the structure elements' arrays into a new structure, essentially David Sanchez's suggestion.

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MATLAB: Creating new variable using for loop and if-else condition

age = 1 : 40; % you were almost close, note: it could be done without loops
[new_age_group1, new_age_group2] = deal(cell(40, 1));
for n = 1 : numel(age) 
    if age(n) >= 10 && age(n) <= 29;
        new_age_group1{n} = age(n); 
    elseif age(n) >= 30 && age(n) <= 39
        new_age_group2{n} = age(n);
    end       
end
new_age_group1 = cat(1, new_age_group1{:})
new_age_group1 = 20×1
    10
    11
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    14
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    16
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    19
new_age_group2 = cat(1, new_age_group2{:})
new_age_group2 = 10×1
    30
    31
    32
    33
    34
    35
    36
    37
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    39
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Best Answer

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MATLAB: How to index within a structure

MATLAB: Creating new variable using for loop and if-else condition

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