matlabmatlab-struct

Assigning values to fields in a 2D array in MATLAB

I have a relatively simple problem that my Google-fu hasn't managed to solve that I think must have a solution.

I have a m-by-n array of values, and I am trying to assign them to fields in a m-by-n structure. This is trivial using a for loop (shown below), I am just wondering there a better/more efficient way of doing it.

values = rand(4,8);

for i = 1:4
    for j = 1:8
        val_struct(i,j).a = values(i,j);
    end
end

Since I need to do this for a lot of fields, I am a bit reluctant to just run through a bunch of for loops if I don't absolutely need to.

Solution

  • You can use num2cell and struct : 

    val_struct = struct('a', num2cell(values));

    Note that numeric arrays are much more efficient than struct arrays.