#!F-adobe-helvetica-medium-r-normal--18*
#!N 
#!CSeaGreen #!N  #!Rtstmln2 Streamlines #!N #!EC #!N #!N If 
your 2-dimensional data set consists of vectors, you can create streamlines 
that trace the path of a massless particle in a vector 
field. #!N #!N #!I0 #!N  #!F-adobe-times-medium-r-normal--18*   #!N #!N #!I30 #!N 1. 
Open and execute visual program .../Streamlines2D.net. The image is a set 
of streamlines that follow a wind field over the surface of 
the earth. #!N #!I30 #!N 2. Change the number of streamlines 
by changing the value of the  #!F-adobe-times-bold-r-normal--18*   density #!EF parameter in 
the configuration dialog box of the  #!F-adobe-times-bold-r-normal--18*   Sample #!EF tool. #!N 
#!I30 #!N 3. Reexecute the visual program. #!N #!I0 #!N #!EF 
#!N Note: Streamlines can be generated in other ways as well. 
For example: #!N #!I0 #!N  #!F-adobe-times-medium-r-normal--18*   #!N #!N #!I30 #!N 1. 
Pass a list of 2-dimensional positions to the  #!F-adobe-times-bold-r-normal--18*   start #!EF 
parameter in the  #!F-adobe-times-bold-r-normal--18*   Streamline #!EF configuration dialog box by either: 
#!N #!I0 #!N  #!F-adobe-times-medium-r-normal--18*   #!N #!N #!I30 #!N a. inserting a 
 #!F-adobe-times-bold-r-normal--18*   VectorList #!EF interactor stand-in (from  #!F-adobe-times-bold-r-normal--18*   Interactor #!EF in the 
categories palette) into the visual program, and connecting it to the 
 #!F-adobe-times-bold-r-normal--18*   start #!EF parameter tab of Streamline  #!F-adobe-times-medium-i-normal--18*   or #!EF #!N 
#!I30 #!N b. typing the start positions in the configuration dialog 
box for  #!F-adobe-times-bold-r-normal--18*   Streamline #!EF . #!N #!I0 #!N #!EF #!N 
#!N #!N #!I30 #!N 2. Use the  #!F-adobe-times-bold-r-normal--18*   Grid #!EF tool 
(from  #!F-adobe-times-bold-r-normal--18*   Realization #!EF in the categories palette) to create a 
particular set of start positions. Any field that contains positions can 
be used as the starting point for streamlines. #!N #!N This 
sample visual program contains a Grid tool. Connect it to the 
 #!F-adobe-times-bold-r-normal--18*   start #!EF parameter tab of Streamline. It generates a 3 
* 3 grid of points. Modify it to create a 10 
* 3 grid of starting points. #!N #!I30 #!N 3. Use 
the  #!F-adobe-times-bold-r-normal--18*   Probe #!EF tool (from  #!F-adobe-times-bold-r-normal--18*   Special #!EF in the 
categories palette) to select starting points in the Image window. #!N 
#!N This sample visual program contains a Probe tool. (Compute is 
used to make the value of the probe point 2-dimensional.) Connect 
the output of Compute to the  #!F-adobe-times-bold-r-normal--18*   start #!EF input tab 
of Streamline, and then move the probe (i.e., enter cursor mode, 
using the  #!F-adobe-times-bold-r-normal--18*   View Control #!EF dialog box). #!N #!I0 #!N 
#!EF #!N #!N #!N See Grid, Probe, and Streamline in IBM 
Visualization Data Explorer User's Reference. #!N #!N #!N  #!F-adobe-times-medium-i-normal--18*   Next Topic 
#!EF #!N #!N  #!Ltrbrsht,dxall46 h RubberSheet  #!EL  #!N  #!F-adobe-times-medium-i-normal--18*   #!N 
