CODEWITHSUNDEEP
matlabmatrix
shaloo shaloo
shaloo shaloo

Reputation: 213

Preallocating a structure with variables of different names, size and type

I am going to use an algorithm in a for loop as an iteration loop. I know that some of the calculations can be done once and the their results can be used as necessary inputs for the algorithm in the for loop so in this way there is no need to calculate the same things in each iteration. To do so, I calculate them once and put them in a structure.

I use structure since I have many variables to be kept to be used in the for loop and their name and size are different. I put them in the structure with the same name for example:

out.A = A;
out.myvector = myvector; 
out.s = s; 
out.Hx_l = Hx_l;

and so on. some of them are matrices, some of them cubes or variables with a forth dimension and some of them are cells.

Is there any way to preallocate this kind of structure?

Upvotes: 0

Views: 52

Answers (1)

brodoll
brodoll

Reputation: 1881

You could initialise the structure the following way:

out = struct('A',[],'myvector',[],'s',[],'Hx',[]);

When you assign the variables afterwards, the structure fields will be already created. Usually the contents are not initialised upfront. Quoting Loren:

How important is it to initialize the contents of the struct. Of course it depends on your specifics, but since each field is its own MATLAB array, there is not necessarily a need to initialize them all up front. The key however is to try to not grow either the struct itself or any of its contents incrementally.

Upvotes: 1

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