Fix Inf error in table writing

CHANGELOG.rst

@@ -20,6 +20,7 @@ Next release
 *Fixed*
 
 * Table writer no longer errors on ``NaN`` scalar values (#2189).
+* Table writer no longer errors on ``Inf`` scalar values (#2196).
 
 6.0.0 (2025-11-21)
 ^^^^^^^^^^^^^^^^^^^^

hoomd/pytest/test_table.py

@@ -257,3 +257,21 @@ def test_nan_is_ok():
     sim.operations.writers.append(table_writer)
 
     sim.run(1)
+
+
+def test_inf_is_ok():
+    # Ensure that Inf value doesn't cause table writer to error
+    sim = hoomd.util.make_example_simulation()
+
+    logger = hoomd.logging.Logger(categories=["scalar"])
+    logger[("test", "inf")] = (lambda: float("inf"), "scalar")
+
+    output = StringIO("")
+
+    table_writer = hoomd.write.Table(
+        trigger=1, logger=logger, output=output, delimiter=","
+    )
+
+    sim.operations.writers.append(table_writer)
+
+    sim.run(1)

hoomd/write/table.py

@@ -11,7 +11,7 @@
 from abc import ABCMeta, abstractmethod
 import copy
 from numbers import Integral
-from math import log10, isnan
+from math import log10, isnan, isinf
 from sys import stdout
 import inspect
 
@@ -128,6 +128,8 @@ def format_num(self, value, column_width):
             # point including the decimal point.
             if isnan(value):
                 return "NaN"
+            if isinf(value):
+                return "Inf"
             min_len_repr = self._digits_from_decimal(value) + 1
             # Use scientific formatting
             if not min_len_repr < 6 or min_len_repr > column_width: