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/usr/share/psychtoolbox-3/PsychHardware/Daq/DaqAInScanBegin.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.

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function params=DaqAInScanBegin(daq,options)
% params=DaqAInScanBegin(DeviceIndex,options)
% Calls DaqAInScan with the options set to only begin, and not continue or
% end. You should subsequently call DaqAInScanContinue (as many times as
% you like) and, finally, DaqAInScanEnd to get the data. For example:
%     options.FirstChannel=FirstChannel;
%     options.LastChannel=LastChannel;
%     options.count=count;
%     options.f=f;
%     params=DaqAInScanBegin(DeviceIndex,options);
%     for i=1:frames
%         % add code here doing something useful
%         params=DaqAInScanContinue(DeviceIndex,options);
%     end
%     params=DaqAInScanContinue(DeviceIndex,options);
%     [data,params]=DaqAInScanEnd(DeviceIndex,options);
% See also DaqAInScan, DaqAInScanContinue, DaqAInScanEnd,
% Daq, DaqPins, DaqTest, PsychHIDTest.

% 4/15/05 dgp Wrote it.
% 1/10/08 mpr glanced at it; made same changes as in DaqAInScanContinue.

options.begin=1;
options.continue=0;
options.end=0;
[data,params]=DaqAInScan(daq,options);

return;