how could numbers be displayed only in 4 digits (also in answer of sprintf)

2011 9 22
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Does anyone know how could numbers be displayed only in 4 digits (also in answer of sprintf) [not more than 4)
a=3.78676789728978978978978789
sprintf('%d',a)= 3.786768e+000 % but i dont need this format
sprintf('%f',a)= 3.786768 % this is better but only 4 digits is needed
I need: 3.7867 or 3.786

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