arviz.sel_utils.xarray_sel_iter

arviz.sel_utils.xarray_sel_iter(data, var_names=None, combined=False, skip_dims=None, reverse_selections=False)

Convert xarray data to an iterator over variable names and selections.

Iterates over each var_name and all of its coordinates, returning the variable names and selections that allow properly obtain the data from data as desired.

Parameters:

dataxarray.Dataset

Posterior data in an xarray

var_namesiterator of strings (optional)

Should be a subset of data.data_vars. Defaults to all of them.

combinedbool

Whether to combine chains or leave them separate

skip_dimsset

dimensions to not iterate over

reverse_selectionsbool

Whether to reverse selections before iterating.

Returns:

Iterator of (var_name: str, selection: dict(str, any))

The string is the variable name, the dictionary are coordinate names to values,. To get the values of the variable at these coordinates, do data[var_name].sel(**selection).