New issue 1272: Error when using load_octree https://bitbucket.org/yt_analysis/yt/issues/1272/error-when-using-load_octre... Anonymous: The following code: ``` #!python import numpy as np from yt.mods import load_octree, ProjectionPlot octree_mask = np.array([8,0,0,0,0,8,0,0,0,0,0,0,0,0,0,0,8,0,0,0,0,0,0,0,0], dtype=np.uint8) quantities = {} quantities[('gas', 'density')] = np.ones((22,1), dtype=float) bbox = np.array([[-10., 10.], [-10., 10.], [-10., 10.]]) spf = load_octree(octree_mask=octree_mask, data=quantities, bbox=bbox, over_refine_factor=0, partial_coverage=0) p = ProjectionPlot(spf, 'x', ['density'], center='c', origin='native') ``` produces the following error: ``` yt : [INFO ] 2016-09-04 22:19:26,815 Parameters: current_time = 0.0 yt : [INFO ] 2016-09-04 22:19:26,815 Parameters: domain_dimensions = [1 1 1] yt : [INFO ] 2016-09-04 22:19:26,816 Parameters: domain_left_edge = [-10. -10. -10.] yt : [INFO ] 2016-09-04 22:19:26,817 Parameters: domain_right_edge = [ 10. 10. 10.] yt : [INFO ] 2016-09-04 22:19:26,817 Parameters: cosmological_simulation = 0.0 Traceback (most recent call last): File "debug.py", line 18, in <module> p = ProjectionPlot(spf, 'x', ['density'], center='c', origin='native') File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/yt/visualization/plot_window.py", line 1433, in __init__ max_level=max_level) File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/yt/data_objects/construction_data_containers.py", line 262, in __init__ self.get_data(field) File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/yt/data_objects/construction_data_containers.py", line 336, in get_data self._handle_chunk(chunk, fields, tree) File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/yt/data_objects/construction_data_containers.py", line 436, in _handle_chunk d = chunk[field] * dl File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/yt/data_objects/data_containers.py", line 272, in __getitem__ self.get_data(f) File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/yt/data_objects/data_containers.py", line 1178, in get_data fluids, self, self._current_chunk) File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/yt/geometry/geometry_handler.py", line 245, in _read_fluid_fields chunk_size) File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/yt/frontends/stream/io.py", line 252, in _read_fluid_selection subset.fill(field_vals, rv, selector, ind) File "/Users/tom/miniconda3/envs/dev35/lib/python3.5/site-packages/yt/frontends/stream/data_structures.py", line 1402, in fill selector, self.domain_id, cell_count) File "yt/geometry/oct_container.pyx", line 775, in yt.geometry.oct_container.OctreeContainer.file_index_octs (yt/geometry/oct_container.c:13230) ValueError: Buffer dtype mismatch, expected 'uint8_t' but got 'long' ``` I'm using yt 3.3.1 from conda-forge and Python 3.5. This works correctly with yt 3.2.3 from conda-forge though, so I think it must be a bug in the 3.3 series?