FILE; PFIL SP 
VECTORS TOTAL 154 
DISPLAY RANGE ; 
FIRST : 1 
LAST: 154 
.. ' ■' ; ' - . 1 
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 they possess the sophistication 
required to manage large collections of arbitrarily derived series (e.g., Figure 
17-2). 
265 
