How to pass contents of cell array to a function?

I have

function [S , U ] = HOSVD ( A )

where U is a cell array of length 3

and I would like the function to return each cell. I tried

    function [S , U{1}, U{2}, U{3} ] = HOSVD ( A )

but it doesn't work, it gives an error regarding the brackets.

How should I write it?

Answer 1

[madhan ravi]

U{:} 

[madhan ravi]

Read https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html

[snowflake]

Hmm, it still says "Invalid syntax at '{'. Possibly a ']' is missing"

[madhan ravi]

Provide all the datas and your code. You function definition seems to be wrong. Also see how to define a function:

https://www.mathworks.com/matlabcentral/answers/437732-error-using-ofdm_mod-not-enough-input-arguments#answer_354468

[snowflake]

function [S,U{:}] = HOSVD ( A )

% U is a length 3 cell array with the
% property that U{k} is the left singular
% vector matrix of A’s mode -k unfolding 

S = A ;

for mode =1:length(size(A)) %mode = 1 , 2 , 3
C = unfolding(A,mode);
[ U{mode} , Sigma , V ] = svd(C);
S = tensormat(S,U{mode}',mode);
end

for example, A is

A(:,:,1) = [ 1 2 ; 3 4 ];
A(:,:,2) = [ 10 20 ; 30 40 ];
A(:,:,3) = [ 100 200 ; 300 400 ];

and I want to call HOSVD(A) and it should return S, a tensor, and U1, U2, U3 matrices that I need later

[madhan ravi]

unfolding , tensormat???

[snowflake]

Nevermind, I just used cell2mat to convert those cell arrays and properly put them in the function def, thank you

[madhan ravi]

alternatively you can use

vertcat(U{:})