% EEG_MS2F - convert epoch latency in ms to nearest epoch frame number
%
% Usage:
%         >> outf = eeg_ms2f(EEG,ms);
% Inputs:
%         EEG - EEGLAB data set structure
%         ms  - epoch latency in milliseconds
% Output:
%         outf - nearest epoch frame to the specified epoch latency
%
% Author: Scott Makeig, SCCN/INC, 12/05

% Copyright (C) Scott Makeig, SCCN/INC, 12/05
%
% This file is part of EEGLAB, see http://www.eeglab.org
% for the documentation and details.
%
% Redistribution and use in source and binary forms, with or without
% modification, are permitted provided that the following conditions are met:
%
% 1. Redistributions of source code must retain the above copyright notice,
% this list of conditions and the following disclaimer.
%
% 2. Redistributions in binary form must reproduce the above copyright notice,
% this list of conditions and the following disclaimer in the documentation
% and/or other materials provided with the distribution.
%
% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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function outf = eeg_ms2f(EEG,ms)
ms = ms/1000;
if ms < EEG.xmin || ms > EEG.xmax
    error('time out of range');
end
outf = 1+round((EEG.pnts-1)*(ms-EEG.xmin)/(EEG.xmax-EEG.xmin));
% else
% [tmp outf] = min(abs(EEG.times-ms));