/usr/share/psychtoolbox-3/PsychRadiometric/PsychAnsiZ136MPE/AnsiZ136MPEComputeLimitingConeAngle.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
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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 27 28 29 | function limitingConeAngleMrad = AnsiZ136MPEComputeLimitingConeAngle(stimulusDurationSec)
% limitingConeAngleMrad = AnsiZ136MPEComputeLimitingConeAngle(stimulusDurationSec)
%
% ****************************************************************************
% 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 the limiting cone angle, ANSI Z136.1-2007, Table 5, p. 75.
%
% This is only defined for durations between 0.7 sec and 3*10^4 sec.
%
% 2/20/13 dhb Wrote it.
%% Implement formula. Factor only defined between 400 and 600 nm
if (stimulusDurationSec < 0.7)
error('Limiting cone angle not defined for durations less than 0.7 sec');
elseif (stimulusDurationSec >= 0.7 && stimulusDurationSec < 100)
limitingConeAngleMrad = 11;
elseif (stimulusDurationSec >= 100 && stimulusDurationSec < 1e4)
limitingConeAngleMrad = 1.1 * (stimulusDurationSec^0.5);
elseif (stimulusDurationSec >= 1e4 && stimulusDurationSec < 3e4)
limitingConeAngleMrad = 110;
else
error('Limiting cone angle not defined for durations greater than 3e4 sec');
end
end
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