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Add noise to vector/scalar fields

FF = addnoisef(F) adds 10% normally-distributed white noise to the 
vector/scalar field(s) F. 
FF = addnoisef(F, EPS) specifies that the standard deviation of the 
white noise is EPS times that of the field(s) F (EPS=0.1 by default). 
FF = addnoisef(F, EPS, OPT) specifies whether the noise is additive 
(OPT='add', by default) or multiplicative (OPT='mul'). 
FF = addnoisef(F, EPS, OPT, N) first filters the noise at scale N (in 
mesh units) before adding/multiplying it to the field(s) F. 
   v = loadvec('*.vc7'); 
See Also
operf, showf, randvec. 
Published output in the Help browser 
   showdemo addnoisef 

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