I want to transmit an image using Simulink and USRP

 function msg = genMsg
%#codegen
persistent msgBinRows msgBinCols msgBin;
coder.extrinsic('imread');
% count;
if isempty(msgBin)
    %count = 0;
    imgmatRows = 256;
    imgmatCols = 256;
    imgmat = zeros(imgmatRows,imgmatCols);
    imgmat = imread('cameraman.tif'); 

    imgvec = reshape(imgmat, 1, imgmatRows * imgmatCols);
    msgBin = de2bi(imgvec, 'left-msb');
    [msgBinRows, msgBinCols] = size(msgBin);
end
msg = reshape(double(msgBin).', msgBinRows*msgBinCols, 1);

When I run this code it produces the following error

Data 'msg' (#24) is inferred as a variable size matrix, while its specified type is something else

How can I fix this problem?

Answer 1

[Walter Roberson]

At the beginning, initialize

msg = zeros(256*256*8, 1);

Warning your de2bi() call really should specify "n".