New issue 921: Querying non-periodic datasets outside of domain fails and needs more descriptive error https://bitbucket.org/yt_analysis/yt/issue/921/querying-non-periodic-dataset... Cameron Hummels: Right now when one attempts to index a region outside of the domain of a non-periodic dataset, one gets a somewhat opaque error. Example: ``` #!python $ yt load GasSloshingLowRes/sloshing_low_res_hdf5_plt_cnt_0690 box = ds.box(ds.domain_right_edge, 2*ds.domain_right_edge) box.quantities.total_mass() RuntimeError: Error: bad Region in non-periodic domain along dimension 0. Region left edge = 3.0856e+24 code_length, R egion right edge = 6.1712e+24 code_lengthDataset left edge = -3.0856e+24 code_length, Dataset right edge = 3.0856e+24 code_length ``` It would be better to have a more descriptive error that you're trying to index a region outside of the valid domain.