set, group in matlab

Hi there,

I want to generate more than 10^4 times of following variables: A and B are 2D complex matrix from some distribution, C is 3D compelx matrix, where each layer of C is generated from some distribution. I am wondering if there a 'set' or 'group' function that can contain all those 10^4 times of A, B, and C? I can create 3D matrix for A and B to store 10^4 times generations, but I dont want to create a 4D matrix for matrix C...it seems inconvenient to access the datas store in them.

Answer 1

[Ramtej]

Hi mingcheng,

I understand you are trying to generate large number of instances of a variable and store them using a set or group function.

Unfortunately, in MATLAB there is no specific built-in data structure for sets and groups.

However, you can use Cell array for grouping the data to create and access the data conveniently.

Documentation for cell array: https://in.mathworks.com/help/matlab/ref/cell.html? searchHighlight=cell&s_tid=srchtitle_support_results_1_cell

% Example
numInstances = 10^4;
final_C = cell(numInstances, 1);

for itr = 1:numInstances
    final_C{itr} = A; % each instance is stored in a separate cell element
end

% you can access the data for each instance of C conveniently without the need for a 4D matrix for C.
reqAns = final_C{n}(i,j,k); % to access (i,j,k)th element of nth instance.

Hope this helps!