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InitialGuess
2D/3D

InitialGuess is an option for Body that specifies the initial guesses for a body's location coordinates in the form InitialGuess->{{x, y}, Theta} (2D) or InitialGuess->{{x, y, z}, {eo, ei, ej, ek}} (3D).
InitialGuess[bnum] returns the current initial guesses of body bnum in the formats noted above.
InitialGuess is also an option for SetCouple that specifies initial guess for all coordinates as a list of rules. Rules are given in the same format as rules for SetGuess.
InitialGuess is also an option for SetFree that specifies initial guesses for the dependent variables in the system as a list of rules. Lower-order terms (independent variables) are given with InitialCondition. Rules are given in the same format as rules for SetGuess.

• If no initial guess is specified for a body, the initial guess is in alignment with the global coordinate system.
• The default setting InitialGuess->Automatic leaves the current guesses unchanged.
• In Modeler2D, initial guesses may also be specified in the format {{x, y}, {ei, ej}} where the degenerate Euler parameters ei and ej are immediately converted to CapitalTheta.
• In Modeler3D, initial guesses may also be specified in the format {{x, y, z}, {vx, vy, vz}} where the second element is a virtual rotation vector, or the format {{x, y, z}, {Theta, {x, y, z}}} where the second element is an angle and axis of rotation. The given rotation is immediately converted to a set of Euler parameters.
• See also:
Centroid, Inertia, PointList, Mass, SetBodies.

Further Examples

Load the Modeler3D package and define a simple model.

Here is the default initial guess of the link body.

The link body is given a new initial guess in the angle-axis format.

See HelpModel3D.


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