How to update the title with variable string as time evolution

2016 12 6
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更新时间：2016 12 6
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How to update the title with variable string as time evolution
figure(1)
hf=surf(x,y,E.^2)
ha=gca
title(['t=',num2str(0)])
xlabel('k_x')
ylabel('K_y')
zlabel('|E|^2')
dt=0.01;
k=1;
while 1
*****
k=k+1;
t=k*dt;
set(hf,'ZData',E.^2)
set(ha,'Title',text(t))
end
The results appear such problems
Error using text
Invalid parameter/value pair arguments
Error in xxxx (line xx)
set(ha,'Title',text(t))

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