Set the spatial dimensionality of a field to 1, 2, or 3.
group Space3 { /* 3-space grid */
int nspace = 3;
};
group Space2 { /* 2-space grid */
int nspace = 2;
};
group Space1 { /* 1-space grid */
int nspace = 1;
};
These field subtypes automatically set the nspace in the Grid of a field.
establishes that the uniform field has nspace=2.