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<HTML><HEAD><TITLE>VIP Demo</TITLE></HEAD><BODY><H2>Programming and Problem Solving by Connecting Diagrams</H2>This is a demonstration of the VIP (View Interactive Programming) program.VIP allows the user to create scientific programs or to solve physicsproblems by connecting diagrams that represent physical andmathematical principles. The following example shows a specificationfor calculating the mass of the sun, following Newton's reasoning,by equating the gravitational attraction of the sun on the earth withthe force required to keep the earth in circular motion.<P><IMG SRC="../sunmass.gif" ALIGN=bottom ALT=><P>When the program is started, a window is created with a command menuand input and output areas. Use the command Output Language to selectthe desired language for the program that is created. (The actualprogram will be served to you in a file that is presented after thedemo program is terminated.) Use the input lines to specify the nameand type of each input variable, one per line, in the format shown.Examples are <CODE>(radius integer)</CODE> and<CODE>(speed (units real mph))</CODE>.Then select the command New Program to start VIP.<P>A VIP program is created by connecting diagram boxes that representvariables and physical and mathematical principles. A connectionsignifies that two quantities are equal. To make a connection,click the mouse, once for each end of the connection, on variable boxesor on "buttons" associated with diagrams. To get a useful program, theremust be a connection to the <CODE>OUTPUT</CODE> box.<P>The VIP commands are as follows:<UL><LI> <CODE>Done </CODE> Finished; make a program from the diagram.<LI> <CODE>Redo </CODE> Start over.<LI> <CODE>Move </CODE> Move a box. Click the box you wish to move.<LI> <CODE>Delete </CODE> Delete a box or a connection.<LI> <CODE>Geometry </CODE> Select a new geometric principle box.<LI> <CODE>Physics </CODE> Select a new physical principle box.<LI> <CODE>Make Var </CODE> Make a local variable.<LI> <CODE>Specify Type</CODE> Specify the type of a variable. This can also be used to specify units.<LI> <CODE>OP </CODE> Make an operation box, such as <CODE>+ - * /</CODE>.<LI> <CODE>Type-in </CODE> Type in a numeric constant, with units if desired.<LI> <CODE>Constant </CODE> Select a predefined constant, such as the speed of light.</UL><HR><H2>Instructions</H2><FORM METHOD=GET ACTION="nph-vip-action"><OL><LI> You must be logged in to a host running X windows.<LI> Type <CODE> xhost + www.cs.utexas.edu </CODE> (exactly as shown at left) in a window on that host to allow this server to write to your display.<LI> Enter your X display name here if needed; you may need to change what is shown in the box to your X display name. For example, <CODE> myterminal.cs.utexas.edu:0.0 </CODE> <BR> <INPUT TYPE=text SIZE=40 VALUE="128.2.209.145:0.0" NAME=xdspname><LI> Click <INPUT TYPE=submit VALUE="here"> to start the demo.</OL></BODY><address><a href="http://www.cs.utexas.edu/users/novak/index.html">Gordon S. Novak Jr.</a></address></HTML></BODY></HTML>⌨️ 快捷键说明
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