How to initialize object array with different parameters?

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Daniel Glazar
Daniel Glazar am 21 Mär. 2019
Kommentiert: Tristan Spiteri am 11 Mär. 2020
This is the sort of thing I want to do:
Define class:
classdef Class
properties
prop
end
methods
function obj = Class(param)
if nargin
obj.prop = param;
end
end
end
end
Then initialize object array like so:
dim = {3,2};
param = 1:6;
obj_arr(dim{:}) = Class(param)
and get and object array like so:
obj_arr =
2x3 Class array with properties:
prop
obj_arr(1,1).prop =
1
obj_arr(2,1).prop =
2
...
obj_arr(3,2).prop =
6
I have one idea that involves using a static method, but I'm having trouble implementing it, and it feels messy to me.
Also, I know that initalizing the object array like that doesn't work. I guess the idea of initializing an object array is to not pass any parameters and have all of them as clones of one another?
The whole reason for asking this question is because right now I'm doing the preallocation, then using a for loop to intiatiate each object (patient), which takes a lot of time, since I've implemented a particle swarm optimization for each object (patient). I want to be able to have the particle swarm optimization run for all the objects (patients) in the cohort at the same time.
Also, I've tried parfor, and it doesn't help any. I have 27 objects (patients) in my cohort.

Akzeptierte Antwort

Guillaume
Guillaume am 21 Mär. 2019
With the current interface, this is probably the best you can do:
dim = [3,2];
param = 1:6;
param = num2cell(param); %each object param must be an element of a cell array
obj_arr(prod(dim)) = Class; %initialise all empty
obj_arr = reshape(obj_arr, dim); %reshape into desired shape
[obj_arr.prop] = param{:}; %deal each parameter to each object
If you use the same interface as the struct function where if the input is a cell array, the output is a structure array, then you could have this:
classdef Class %what a dangerous name! Too close to the all useful: class
properties
prop
end
methods
function obj = Class(param)
if nargin
if iscell(param)
[obj(1:numel(param)).prop] = param{:};
else
obj.prop = param;
end
end
end
end
end
%usage:
param = num2cell(1:6);
obj_arr = Class(param) %create a 1x6 array
celldisp({obj.arr}) %verify that each object got a single param.
  4 Kommentare
Daniel Glazar
Daniel Glazar am 22 Mär. 2019
Bearbeitet: Daniel Glazar am 22 Mär. 2019
Okay, really my implementation of solution is a little messy. Just wanted to get it working first. Now I can clean up what I currently have. And looking back at what you wrote, I think it is pretty neat/elegant. And good point about arrayfun. Thanks again!
Tristan Spiteri
Tristan Spiteri am 11 Mär. 2020
lets say my class had 2 properties, how could I go about doing something similar.
I want an array of my object that are initialised with different paramaters for each property.
Sorry im very new to matlab, any help would be appreciated.

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