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How can I cut some digits from a number?

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sadel
sadel 2011-6-26
How can I cut some digits from a number like this 0.0000005566?
How can I keep only the first 4 decimal digits?
I use vpa but this return something else.
b=0.0000005566
vpa(b,4)
ans =
5.566*10^(-7)
examples:
0.0000345->0
0.001234->0.0012
12.4234234->12.4234
121313.334242->121313.3342

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采纳的回答

Oleg Komarov
Oleg Komarov 2011-6-26
n = 121313.334242;
fix(n*10000)/10000

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