Title output weird fonts for gplt after xlabel with a greek font

[Lingyun]

I met a strange problem. The code below runs OK in matlab. But I tried to run
it in octave, the title fonts output strange. 
xlabel('\lambda(nm)')
ylabel('\epsilon_i')
title('Imaginary part of the permittivity of gold')
Then the title output all in Greek letters instead of normal english
letters. 
But if xlabel contains normal English letters, then the title output
correctly. 
How to fix it?

Thanks. 

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