"Assignment has more non-singleton rhs dimensions than non-singleton subscripts" how to solve this error?

Hello,

I got the error "Assignment has more non-singleton rhs dimensions than non-singleton subscripts" in a line of code

 ber(k,iter)=sum(abs((decoded_bits - X)));

the codes is:

 N=64;
 X=randi( [0 1],N, 1); 
...
for k=1:length(SNR) 
...
for iter=1:Iteration
...
 decoded_bits=zeros(1,N);
 decoded_bits(LAPPR_mod>0)=1;
 if BCJR==0 
 ber(k,iter)=sum(abs((decoded_bits - X))); 
...

How to solve this error?

Answer 1

[KL]

What exactly are you trying to do?

 X has 64 rows and 1 column
 decoded_bits has 1 row and 64 column

and when you say,

 decoded_bits - X

you get 64 rows and 64 columns (implicit expansion).

when you make sum out of it, you still get 1 row and 64 columns and you're trying to assign it to one element of ber.