Value Command
This computes the value of a field quantity at a point. Use it to find
- The magnitude of a scalar field quantity at that point.
- The x-, y-, and z-components of a vector field quantity at that point.
To find the value of a field quantity at a point:
- Load the field quantity into the top register, and perform any needed operations on it.
- Load the appropriate point into the calculator using the Geometry/Point command.
- Click Value.
To view the numerical results of this operation, use the Eval command.
You can also use the Value command to access the intermediate SurfaceValue function
For example, after inputting an expression for a quantity, such as an E field, and then selecting a surface geometry, the calculator stack displays something like this.
Clicking the Value command changes the display to the following, showing the intermediate SurfaceValue function.
In this case SurfaceValue provides the x, y, z, coordinates of the FEM mesh and Lagrangian points so you can use Write to generate an .fld file containing an evaluated scalar quantity at those points. In general for Value:
- Enter any quantity onto the stack.
- Enter a volume / surface / line / point onto the stack.
- Press the Value button and you will get an appropriate geometry value on the stack.
Now you can perform suitable operations such as Write, Integrate, etc. For PointValue, you can also do Eval.