/usr/share/psychtoolbox-3/PsychRadiometric/PsychAnsiZ136MPE/AnsiZ136MPEComputeT2.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
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 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | function T2Sec = AnsiZ136MPEComputeT2(stimulusSizeDeg)
% T2Sec = AnsiZ136MPEComputeT2(stimulusSizeDeg)
%
% ****************************************************************************
% IMPORTANT: Before using the AnsiZ136 routines, please see the notes on usage
% and responsibility in PsychAnsiZ136MPE/Contents.m (type "help PsychAnsiZ136MPE"
% at the Matlab prompt.
% ****************************************************************************
%
% Compute time T2, ANSI Z136.1-2007, Table 6, p. 76
%
% 2/20/13 dhb Wrote it.
%% Convert angle to mrad
stimulusSizeMrad = DegToMrad(stimulusSizeDeg);
%% Implement the table with its various special cases
if (stimulusSizeMrad < 1.5)
T2Sec = 10;
elseif (stimulusSizeMrad > 100)
T2Sec = 100;
else
T2Sec = 10*10^((stimulusSizeMrad-1.5)/98.5);
end
end
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