Trajectory tool works fine but trajectory trend fails

[rosshandler]

Hi WOT team,

Thanks for this awesome tool. I am finding a problem when computing the trajectory trends after running the trajectory tool with no issues (at least the output looks normal).

The entire pipeline used to work fine. Then a friend help me with some other python package and I guess he changed something and now the trajectory trend command is crashing. I have reinstalled everything as well as updated wot but the error is still there. In summary the same input that used to work is not doing it anymore. Do you recognise this error:

wot trajectory_trends --trajectory traj.txt
--matrix matrix.mtx
--out trends --cell_days time.txt

Traceback (most recent call last): File "/homes/iimaz/.local/bin/wot", line 11, in sys.exit(main()) File "/homes/iimaz/.local/lib/python3.6/site-packages/wot/main.py", line 23, in main cmd.main(command_args) File "/homes/iimaz/.local/lib/python3.6/site-packages/wot/commands/trajectory_trends.py", line 24, in main matrix = wot.io.read_dataset(args.matrix) File "/homes/iimaz/.local/lib/python3.6/site-packages/wot/io/io.py", line 472, in read_dataset header=None) File "/homes/iimaz/miniconda3/lib/python3.6/site-packages/pandas/io/parsers.py", line 702, in parser_f return _read(filepath_or_buffer, kwds) File "/homes/iimaz/miniconda3/lib/python3.6/site-packages/pandas/io/parsers.py", line 429, in _read parser = TextFileReader(filepath_or_buffer, **kwds) File "/homes/iimaz/miniconda3/lib/python3.6/site-packages/pandas/io/parsers.py", line 895, in init self._make_engine(self.engine) File "/homes/iimaz/miniconda3/lib/python3.6/site-packages/pandas/io/parsers.py", line 1122, in _make_engine self._engine = CParserWrapper(self.f, **self.options) File "/homes/iimaz/miniconda3/lib/python3.6/site-packages/pandas/io/parsers.py", line 1853, in init self._reader = parsers.TextReader(src, **kwds) File "pandas/_libs/parsers.pyx", line 545, in pandas._libs.parsers.TextReader.cinit pandas.errors.EmptyDataError: No columns to parse from file

Best, Ivan

[rosshandler]

Brief update: I discovered this does not crash if I use a non sparse matrix. It worked fine with a normal matrix.

Best, Ivan