Only interested in one parameter

SO I have the following code from a book I recently read: I am however only interested in "b" in [P,b]. So I want it to return "P" and "b" in my workspace so I can look at "b" values. How can I do that? Currently If I runt it as it is I get "ans" in my workspace, but when I klick on it its hard to distinguish whats b- values and what P-values

function [P, b]=AmericanPrice(r,delta,sigma,K,nx,nt,Xhat,That)
%Usage:P=AmericanPrice(r,delta,sigma,K,nx,nt,Xhat,That) 
%P=AmericanPrice(0.08,0.12,.2,100,50,10,300,3);
dx=Xhat/nx; 
dt=That/nt; 
for i=1:nx-1 
    A(i,i:i+2)=[((r-delta)*dt*i-sigma*sigma*dt*i*i)/2
        1+r*dt+sigma*sigma*dt*i*i
        (-(r-delta)*dt*i-sigma*sigma*dt*i*i)/2]; 
end
P(:,1)=max(K-[0:dx:Xhat],0);

if(delta==0) 
    b(1)=K; 
else
    b(1)=min(K,K*r/delta);
end

for j=2:nt+1 
    bn=0; run=1; 
    while(run) 
        An=[A(1+bn:end,1+bn:end)]; 
        An(end+1,end-1:end)=[-1 1]; 
        An(end+1,1)=1; 
        Cn=[P(bn+2:nx,j-1)' 0 K-bn*dx]'; 
        Pn=inv(An)*Cn; 
        if(Pn(2)<K-((bn+1)*dx)) 
            bn=find(sign(diff(Pn)/dx+1)-1,1,'last')+bn; 
        else
            b(j)=bn*dx; run=0; 
        end
    end
    P(:,j)=[K-[0:bn-1]*dx Pn']; 
end