accessing to parameters of a volVectorField
 

hi I want to access the parameters of a volVectorField I try this:
forAll( p,celli){
if ( p[celli] < 1.e-5 )
{
...

}
}

it works for a volScalarField but I want to do something on u a volVectorField that has ux , uy , uz ,when (ux < 1.e-5 ) and I don't know how to do this? thanks to help me.

luckily I can solve my problem first I try this:
forAll(U , celli){
if (U[celli] < vector(1.e-5 , 1.e-5 , 1.e-5) )
{
.......
}
}

and it works, later I use this trick:

volScalarField UU = U.component(0); // gives me Ux
foaAll(UU , celli){
if (UU [celli] < 1.e-5 ) // check if Ux smaller than 1.e-5
{
..........
}
}

and it works!:eek: