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Hello, I have a data frame of the following form block trial dv 1 1 10 1 1 11 1 1 9 1 2 12 1 2 9 1 3 12 1 3 13 1 3 14 1 3 15 1 4 12 1 4 11 1 4 10 1 4 9 1 4 11 and need to number the rows consecutively in the following manner block trial dv sequ 1 1 10 1 1 1 11 2 1 1 9 3 1 2 12 1 1 2 9 2 1 3 12 1 1 3 13 2 1 3 14 3 1 3 15 4 1 4 12 1 1 4 11 2 1 4 10 3 1 4 9 4 1 4 11 5 Any idea how to solve

Hello, I have been struggling for quite some time to find a solution for the following problem. I have a data frame which is organized by block and trial. Each trial is represented across several rows in this data frame. I'd like to extract the first x rows per trial and block. For example block trial x y 1 1 1 605 150 2 1 1 603 148 3 1 1 604 140 4 1 1 600 140 5 1 1 590 135 6 1 1 580 135 7

Hello, I have run an eye-tracking experiment for which I now like to analyse the saccades. Participants looked from a fixation cross (ia = 5) to the target area (ia = 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

Hello, I have written a function in order to analyse gaze paths. It works with the test data but when I try to apply the function to a data frame that stores "the real data" in columns I receive the error message that the " In if (pp > 1) { : condition has length > 1 only the first element will be used " I interpret this error message as saying that only the first