/usr/share/psychtoolbox-3/PsychRadiometric/EnergyToQuanta.m is in psychtoolbox-3-common 3.0.11.20140816.dfsg1-1.
This file is owned by root:root, with mode 0o644.
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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 | function quanta = EnergyToQuanta(wls,energy)
% quanta = EnergyToQuanta(wls,energy)
%
% Convert energy units (energy or power per unit wavelength)
% to quantal units (quanta or quanta/sec per unit wavelength).
%
% Constants are set up so that we have energy in joules or
% power in watts. Wavelengths should be passed in nanometers.
%
% The routine is set up to convert spectra. These are
% passed as the columns of the matrix energy. The
% wavelengths corresponding to each row are passed in
% the column vector wls.
%
% 7/29/96 dhb Wrote it.
% 8/16/96 dhb, abp Modified interface.
wls = MakeItWls(wls);
h = 6.626e-34;
c = 2.998e8;
[n,m] = size(energy);
quanta = (energy/(h*c)) .* (1e-9 * wls(:,ones(1,m)));
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