| type | string | "Force", "Displacement", "Velocity", or "Acceleration" |
| node | node | The name or ID of a node, or a pointer to a Node object. |
| largeMass | double | large mass |
| component | string | Sx, Sy, Sxy, etc.. See element reference manual for details |
| amplitude | optional double | amplitude |
| Return value | IFGraph |
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