Input of CRC when the input is random in matlab

I have this code for CRC code in MATLAB, msg is the data and poly is the generator function.

msg=[1 0 1 1 0 0 1 0 1 ]; 
poly=[1 0 1 1]; 
[M, N]=size(poly);
 mseg=[msg zeros(1,N-1)];
 [q, r]=deconv(mseg,poly);
 r=abs(r); 
for i=1:length(r)
        a=r(i);
        if ( mod(a,2)== 0 )
            r(i)=0;
        else
            r(i)=1;
        end end

    crc=r(length(msg)+1:end) frame = bitor(mseg,r)

It works well but I want to do it for random msg with size of 7. I used this but it has error.

msg = randi([0, 1], 7,1);

please help me with this problem.