In addition to the built-in math functions and operators, external C-programs can also be called from within a math expression. This enables you to process plot data from within the program using your own set of specialized programs. For example, the external program can be a customized filter for manipulating plot data or a program that passes plot data to another application for processing.
External programs must be registered in the preferences file before they can be called from within a math expression. Registering an external program associates the program file with a function name. External programs can be registered in your own preferences file or in the global preferences file, making it available to everyone on the network.
| Note | See Altair IPC for more information on writing and calling external C-programs from within a math expression. |
| See the *RegisterExternalFunction() statement in Preference Files help for more information on registering external functions in the preferences.mvw file. |
How do I...
| 1. | From the Define Curves panel, click the Functions... button. |
| 2. | Select the extern function from the Functions list and click OK. |
Or
| 1. | Double-click the extern function displayed in the Functions list. |
| 2. | The extern function is inserted into the expression. |
Or
| 1. | Type extern followed by any necessary arguments. |
| 2. | Enter the name of the external program as the first argument in the function. |
| 3. | Enter any parameters to be passed to the external program as additional function arguments. |
The external program is executed when the X and Y math expressions are evaluated. Once the data vectors are processed, the curve is displayed in the plot.
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See Also
Curve Calculator
Compile MATLABFn
