I need help with my MATLAB code. I am trying to calculate m in the code. I multiply $($u$-$b$)$ by A to get m$.$ The problem is that size of u$-$b is $3$ by $1$ and size of A is $3$ by $3,$ so size of m should by $3$ by $1$ as well, but in my case I get a $3$ by $3$ matrix. Also I have to put a dot in the code here m $=($u$-$b$).*$A; otherwise it shows an error. I don't know why it does that. can you help me fix the code

u $=[5\mathrm{.}0018696581196584,17\mathrm{.}863820207570207,-13\mathrm{.}086858974358975]\text{'}$;

$\%$ Hard iron offset $($assume known or estimated$)$

b $=[0\mathrm{.}5,-0\mathrm{.}3,0\mathrm{.}1]\text{'}$; $\%$ Example offset

B $=$ mean$($u$)$;

R $=($u$-$b$)*$B$^2*($u$-$b$)\text{'}$;

A $=$ real$($sqrtm$($R$))$;

m $=($u$-$b$).*$A;

size$($u$-$b$)$

size$($A$)$

size$($m$)$