CODEWITHSUNDEEP
arraysmatlabinitializationcell-array
s5s
s5s

Reputation: 12134

How to create cell-array in MATLAB and initialize all elements to the same object?

I have a matrix (call it X) that is initialized to say zero(3).

I want to change the code so that X is a cell array of size (say) (3,1) and initialize each element to zero(3).

I can do it with a loop but is there a better way?

X = cell(3,1);
for ii=1:numel(X)
    X{ii} = zeros(3);
end

Upvotes: 12

Views: 21630

Answers (3)

Dennis Jaheruddin
Dennis Jaheruddin

Reputation: 21563

And yet another way:

X = {zeros(3)};
X(1:3,1) = X;

This solution uses the fact that you can assign to indices that lie beyond the variables size. Matlab will automatically expand in this case.

Similarly:

clear X;
X(1:3,1) = {zeros(3)};

Upvotes: 3

Amro
Amro

Reputation: 124563

An alternative way:

X = repmat({zeros(3)}, 3, 1);

another one:

X = cell(3,1);
X(:) = {zeros(3)};

Upvotes: 11

John Colby
John Colby

Reputation: 22588

You can do this with deal().

>> [X{1:3, 1}] = deal(zeros(3))

X = 

    [3x3 double]
    [3x3 double]
    [3x3 double]

Upvotes: 11

Related Questions