# Root Mean Square Deviation

Calculates the RMS difference value between a give expression and a desired curve.

Input | Description |
---|---|

Desired Curve | Choose existing curve from the model using the Curve collector to define the desired behavior. |

Response Expression | A function that is computed during the run and RMS difference is calculated between this function and the Desired Curve. |

Specify independent variable | Turn ON this check box to use a solver variable as an independent variable for both Desired Curve and Response Expression. When OFF; by default, Time is used as independent variable. |

The Show desired curve… button can be used to plot the Desired Curve on graph.

In the above example, the response variable computes the root mean square deviation between a marker’s X displacement and the desired displacement profile defined by the curve “X-Vals”.