search for: eyetracker

Hi, All. I am working with some eye-tracking data. I have a graph I generate in R with arbitrary plotting commands which I want to display. Then I want to plot the eyetracking data overlayed on it. The eye-tracking data is in x-y coordinates on a 640x480 coordinate system. Ideally, what I'd like to do is plot my R graph (e.g., plot(1:10)), and then change the complete coordinate system of

...= 4) in following example of a data frame. ia = 9 stands for everything else. A saccade is indicated by saccade = 1. Sometimes the saccade just ends before the target area (see below). This is due to the parameters that determine a saccade and a fixation and some measurement error (accuracy of the eyetracker). I like to include the first two no-saccades in a target area into the saccade. The simplest approach, at least to my knowledge, would be to replace the value saccade = 0 with saccade = 1 for the first two ia = 4 (see the example below). But that is beyond my rather limited knowledge in R. My da...