MATLAB: Are some of the blocks in the model not visible in Simulink 4.1 (R12.1)

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I have a large model in Simulink and I have used the SET function to set the position of some of the blocks in the model. The simulation results indicate that the blocks are there, but I cannot scroll over enough to see them. It appears that the SET function lets me specify positions that are off of the page.

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This bug has been fixed in Release 14 Service Pack 3 (R14SP3). For previous product releases, read below for any possible workarounds:

We have verified that there is a bug in Simulink 4.1 (R12.1) that allows the SET command to accept arguments for the position that are beyond the size of the Simulink page.

To work around this issue, use the SET_PARAM command rather than the SET command when specifying the position of a block.

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MATLAB: Does the uipanel become corrupted when I change its parent in MATLAB 7.0 (R14)

This bug has been fixed in Release 14 Service Pack 2 (R14SP2). For previous releases, please read below for any possible workarounds:

This has been verified as a bug in MATLAB 7.0 (R14) in the way that the uipanel's parent handles changes.

There are currently no known workarounds.

MATLAB: Does the Algebraic Constraint block not constrain the input to zero in Simulink 4.1 (R12.1)

The issue is being caused by the fact that Simulink resolves the algebraic loop using a Newton-Raphson iteration, which works well when the initial condition (given in the block) is close to a solution. The problem is that you do not always know a good initial condition, and the resulting Newton-Raphson iteration often does not converge, leaving a "z" value that does not give f(z)=0. This is not a bug in Simulink since all nonlinear solution methods sometimes fail to converge for certain problems and certain initial conditions.

As a workaround, a new type of algebraic loop solver has been added to Simulink 5.0 (R13). To use this solver, at the MATLAB prompt type,

   set_param(model,'AlgebraicLoopSolver',solverOption);

where solver option can be either 'TrustRegion' (the default), or 'LineSearch'. Both the default loop solver, and the new line search method are variants of a Newton-Rhaphson method. The hidden parameter 'AlgebraicLoopSolver' was made available in Simulink 6.2 (R14SP2). For more information on algebraic loop solvers in Simulink, see the Related Solution "How exactly does Simulink 6.0 (R14) and Simulink 6.1 (R14SP1) solve algebraic loops?"

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Related Solutions

MATLAB: Does the uipanel become corrupted when I change its parent in MATLAB 7.0 (R14)

MATLAB: Does the Algebraic Constraint block not constrain the input to zero in Simulink 4.1 (R12.1)

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