/usr/share/psychtoolbox-3/Psychometric/LogToDb.m is in psychtoolbox-3-common 3.0.9+svn2579.dfsg1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | function dbUnits = LogToDb(logUnits)
% dbUnits = LogToDb(logUnits)
%
% Convert from log units to decibels.
%
% 1/5/95 dhb Wrote it.
dbUnits = logUnits*20;
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