This structure does not have a field 'rbm'; new fields cannot be added when structure has been read or used. #MATLAB Coder

The cope snippet is here:

function dbn = randDBN( dims, type )

#codegen %coder.extrinsic('cell');

% dbn.rbm = cell( numel(dims)-1, 1 ); % dbn=struct('rbm',zeros(3,1)); % dbn.rbm{1}=0;

dbn.rbm{numel(dims)-1, 1}=[]; % dims is [1 2 3 4]

Earlier I tried to initialize dbn.rbm with 0. it didnt worked as it was referring to the non-cell array element.

[Virtualkeeda]

Earlier I was using : dbn.rbm = cell( numel(dims)-1, 1 );

but cell operation cant be applied to struct in code generation. thats why I started using dbn.rbm{numel(dims)-1, 1}=[];

Answer 1

[Ryan Livingston]

MATLAB Coder support for cell arrays inside of structures was added in MATLAB R2017b:

https://www.mathworks.com/help/coder/release-notes.html?rntext=%22Cell+arrays+and+classes+in+structures%22&startrelease=R2015b&endrelease=R2018a&groupby=release&sortby=descending&searchHighlight=%22Cell+arrays+and+classes+in+structures%22

In R2017b the code:

function dbn = randDBN( dims, type )
%#codegen

% Make dbn.rbm a cell array with each element equal to []
dbn.rbm = repmat({[]}, numel(dims)-1,1);

works fine with:

>> codegen randDBN -args {1:4}