Figure 17-1. Merged Path File of Daphnia Pulex Swimming with 

 Respect to the Reference Frame of the Linear Polarizer. 



NOTE: The E-vector is horizontal to the field of view. The experiments and 

 analyses which gave rise to these data are discussed in the text. 



Generating and Transforming Time Series Data 



Time series of X and Y coordinate values are generated from path data by 

 my means of the SPLIT operator whose command syntax is illustrated by the 

 entry 



*SPLI BUGS.PA BUGS.X BUGS.Y. 



Each data vector in the resultant files "BUGS.X" and "BUGS.Y" is, 

 respectively, a time series of X and Y coordinate values. The resultant data sets 

 are in one-to-one correspondence and each element is represented as a single 

 precision floating point number. Like the paths from which they are derived, 

 resultant time series may start and end at arbitrary points in time. Therefore, 

 the number of series defined at any given moment is also arbitrary. Other 

 computer systems have been developed for the analysis of equispaced time 

 series (7). After image processing has been completed, the operators available 

 on the Bugsystem are unique only insofar as they possess the sophistication 

 required to manage large collections of arbitrarily derived series (e.g., Figure 

 17-2). 



265 



