mt_measures error: Error in points[1, ] : incorrect number of dimensions

Comments

• jericson

  February 2019 edited February 2019

  I think I found the .csv problem (Question 1 above): one participant has only 2 points in the timestamps and x and y position columns (maybe an immediate click when the trial started?) for 2 of the 15 or so trials. Is there a way to omit these trajectories on import?
• Pascal

  February 2019

  Hi J,

  regarding question 1: you identified the problem correctly - you need more than 2 recorded positions.

  Mousetrap provides a function for counting the number of recorded positions which can then be used to exclude the trials. An example could look like this:

  library(mousetrap)
  
  # Import example raw data
  mt_example <- mt_import_mousetrap(mt_example_raw)
  
  # Count number of recorded positions per trial
  mt_example <- mt_count(mt_example, save_as = "data")
  
  # Look at number of of recorded positions
  table(mt_example$data$nobs)
  
  # Only keep trials with more than 2 recorded positions
  mt_example <- mt_subset(mt_example, nobs>2)
  
  

  Best,

  Pascal
• Pascal

  February 2019

  Regarding question 2: indvidual ideal end points per trial (other than the actual start and end points, that are ued by default) are so far not implemented in mt_deviations. As a workaround, you could create subsets of the data using mt_subset for each target that has a different ideal start and end point and run mt_deviations separately for each subset.