MATLAB: Using variables in a legend, title, or axis

Question

Is it possible to insert variables into a string like a legend or title? For example, I'm modeling a difference equation, and I'm using for-loops to test different parameters within the equation; is it possible to plot the results where the parameter value can be displayed in a legend or title with each for-loop iteration? Thanks!

x=zeros(1,100);
for p=1:3  %test different values for parameter lambda
    lambda=p*20; %lambda changes arithmetically
    for q=1:3 %test different values for parameter b
        b=q;
        for n=1:99
            x(1)=1;
            x(n+1)=lambda*x(n)/(1+x(n))^b;
        end
        figure
        plot(1:100,x,'r')
    end
end

Answer 1

title( sprintf('lambda = %f', lambda) );