#!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
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