CODEWITHSUNDEEP
arraysmatlabstructure
jsjq
jsjq

Reputation: 51

MATLAB Array of structures assignment

I have an array of structures. Lets say s(1).value, ... , s(5).value. I have a vector of values, lets say vals = [1 2 3 4 5], that i want to assign to the array of structures. So written in pseudocode i want: s(:).value = vals.

As shown below there is a know solution. But is it really not possible to do this assignment in 1 line as in the pseudocode?

% Vector of values
vals = [1 2 3 4 5];
n = length(vals);

% Initialize struct
s(n).values = 0;

% Put vals into my struct.values
[s(1:n).values] = ???

% Known solution that i am not satisfied with:
vals_c = num2cell(vals);
[s(1:n).values] = vals_c{:};

Best regards, Jonas

Upvotes: 4

Views: 153

Answers (2)

Abhinav Ralhan
Abhinav Ralhan

Reputation: 585

Having recently gone through the same phase I thought I'd answer this one.

To create a new structure with one field:

field = 'f';
value = {'some text';
         [10, 20, 30];
         magic(5)};
s = struct(field,value)

Create a nonscalar structure with several fields:

field1 = 'f1';  value1 = zeros(1,10);
field2 = 'f2';  value2 = {'a', 'b'};
field3 = 'f3';  value3 = {pi, pi.^2};
field4 = 'f4';  value4 = {'fourth'};

s = struct(field1,value1,field2,value2,field3,value3,field4,value4)

Also, as I'd always suggest, going over the documentation a few times is quite necessary and useful, so there you go. https://in.mathworks.com/help/matlab/ref/struct.html

Upvotes: 1

Trogdor
Trogdor

Reputation: 1346

It's possible to do this in one line using cell2struct in conjuction with num2cell.

% Vector of values
vals = [1 2 3 4 5];
n = length(vals);


% Put vals into my struct.values
s = cell2struct(num2cell(vals), 'values', 1)

% transpose if orientation is important
s  = s.';

it's not pretty, but it does do it in one line. cell2struct supports multiple entries so you may be able to populate many fields.

The big downside is that it creates the struct from scratch, so you'd have to do a struct merge if you need to add this data to an existing struct.

Upvotes: 1

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