Table writer errors when writing values equal to zero

[Tim Moore]

Description

The recent fixes to the table writer for small values leads to a domain error when trying to write 0 because of the log10 call in the _digits_from_decimal function.

Script

import hoomd
from io import StringIO

logger = hoomd.logging.Logger(categories=['scalar'])
logger[('zero',)] = (lambda: 0.0, 'scalar')
table_writer = hoomd.write.Table(1, logger, StringIO(""))
sim = hoomd.util.make_example_simulation()
sim.operations.add(table_writer)
sim.run(1)

Input files

No response

Output

Traceback (most recent call last):
  File "/Users/mtimc/sandbox/test-table.py", line 9, in <module>
    sim.run(1)
  File "/Users/mtimc/mambaforge/lib/python3.10/site-packages/hoomd/simulation.py", line 562, in run
    self._cpp_sys.run(steps_int, write_at_start)
  File "/Users/mtimc/mambaforge/lib/python3.10/site-packages/hoomd/write/table.py", line 317, in act
    self._write_row(output_dict)
  File "/Users/mtimc/mambaforge/lib/python3.10/site-packages/hoomd/write/table.py", line 296, in _write_row
    self.delimiter.join(
  File "/Users/mtimc/mambaforge/lib/python3.10/site-packages/hoomd/write/table.py", line 297, in <genexpr>
    (self._fmt(data[k], headers[k]) for k in headers)))
  File "/Users/mtimc/mambaforge/lib/python3.10/site-packages/hoomd/write/table.py", line 97, in __call__
    return self.format_num(value, column_width)
  File "/Users/mtimc/mambaforge/lib/python3.10/site-packages/hoomd/write/table.py", line 122, in format_num
    min_len_repr = self._digits_from_decimal(value) + 1
  File "/Users/mtimc/mambaforge/lib/python3.10/site-packages/hoomd/write/table.py", line 102, in _digits_from_decimal
    digits = int(log10(abs(num)))
ValueError: math domain error

Expected output

No errors.

Platform

CPU, macOS

Installation method

Conda package

HOOMD-blue version

4.2.0

Python version

3.10.12