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- function [actual_frames actual_seconds, nominal_frames nominal_seconds] = JA_frames_function(secs, ifi)
- % first output = numer of frames output already shortened by a 0.5*frames to insert into
- % the (Screen('Flip'), VBL) as waiting
- % second output = true seconds to wait for the next flip to happen
- % rounds the indicated time to an exact number of frames
- nominal_frames = round(secs/ifi);
- % subtract half frames in order not to risk an overshoot (longer duration than required)
- actual_frames = nominal_frames - 0.5;
- % true waiting
- actual_seconds = actual_frames*ifi;
- nominal_seconds = secs;
- end
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