[gf<cartesian_product<X,Y,…>>] Multiple variables¶
Domain & mesh¶
The domain is a cartesian product of domains.
The mesh is a cartesian product of the corresponding meshes.
Subscript operator¶
In addition to the general subscript functionality of the Green function, the cartesian product provides the functionality to write expressions such as
g[x1, x2, ..]
where the xi are mesh points of the respective mesh-component of the cartesian product.
Clef expressions¶
The subscript operator in clef expression assignment has also been extended to allow for assignments of the kind
g[_x1, _x2, ..] << g1[y1, _x1] * g2[_x2, y2] * ...
where the _xi are clef placeholders, and yi denote mesh points of the respective meshes of the gi.
Singularity¶
None.
Interpolation method¶
A multidimensional linear interpolation is automatically built from the linear interpolation of the domains.
Data storage¶
Like single variables gf, the first index of the array is a flattening of the indices of the composite mesh.
HDF5 storage convention¶
For convenience, in hdf5 files, the arrays has higher dimension, so that the first indices are not flatten. EXPLAIN.