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[FIX] Address divide by 0 issue in decay.py #807

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Sep 22, 2021
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[FIX] Address divide by 0 issue in decay.py #807

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6 changes: 5 additions & 1 deletion tedana/decay.py
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,11 @@ def _apply_t2s_floor(t2s, echo_times):
echo_times = echo_times[:, None]

eps = np.finfo(dtype=t2s.dtype).eps # smallest value for datatype
temp_arr = np.exp(-echo_times / t2s) # (E x V) array
nonzerovox = t2s != 0
# Exclude values where t2s is 0 when dividing by t2s.
# These voxels are also excluded from bad_voxel_idx
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temp_arr = np.zeros((len(echo_times), len(t2s)))
temp_arr[:, nonzerovox] = np.exp(-echo_times / t2s[nonzerovox]) # (E x V) array
bad_voxel_idx = np.any(temp_arr == 0, axis=0) & (t2s != 0)
n_bad_voxels = np.sum(bad_voxel_idx)
if n_bad_voxels > 0:
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