Control Design Toolset: Set of interior points within the stable gain set is empty - problem may be infeasible (i.e., could not solve linear inequalities) or numerical search may lack sufficient resolution. Control Design Toolset: Stable gain set interior points are infeasible, possibly due to the specified minimum gain/phase margins. Control Design Toolset: Stable gain set was empty due to infeasible K3 range. Control Design Toolset: Input model must be proper. Control Design Toolset: Input state space models must be SISO. Control Design Toolset: Input models must not have time delays. Control Design Toolset: Input models must be discrete. Control Design Toolset: Number of inputs and outputs of the first model do not match the number of input and outputs of the second model Control Design Toolset: The parallel interconnection with a transfer function model must have the same transport delay. Control Design Toolset: The number of inputs of the first model is not equal to the number of outputs of the second model. Control Design Toolset: The denominator cannot equal zero. Control Design Toolset: At least one delay is less than zero. Control Design Toolset: The denominator must have one element. Control Design Toolset: The numerator must have one element. Control Design Toolset: Matrix R not provided. Control Design Toolset: The dimension of w is not consistent with the dimensions of the stochastic state-space model. Control Design Toolset: The dimension of v is not consistent with the dimensions of the stochastic state-space model. Control Design Toolset: Cross-covariance matrix does not have proper dimensions. Control Design Toolset: The cross-covariance matrix is not valid. Control Design Toolset: Number of rows of E{v} is not of proper dimensions. Control Design Toolset: The dimension of E{w} is not proper. Control Design Toolset: The dimensions of the covariance matrix are improper. Control Design Toolset: The covariance matrix is not positive semi-definite. Control Design Toolset: N is not valid. Control Design Toolset: The pair (Ahat,B) is not stabilizable. Refer to the online documentation of this VI for a definition of Ahat. Control Design Toolset: The dimensions of the R matrix are not equal to number of inputs/number of columns of the B matrix. Control Design Toolset: The R matrix is not positive definite. Control Design Toolset: The R matrix is not symmetric. Control Design Toolset: The Q matrix is not symmetric. Control Design Toolset: The covariance matrix is not symmetric. Control Design Toolset: Controller is not in a stand-alone configuration. Control Design Toolset: Matrix Q is not positive semi-definite. Control Design Toolset: Gain rows not equal to number of outputs Control Design Toolset: Gain columns are not equal to number of inputs. Control Design Toolset: The system model does not have an input. Control Design Toolset: The index specified in the input, output, or state vector is greater than the maximum system dimension. Control Design Toolset: Matrix D not provided. Control Design Toolset: Matrix C not provided. Control Design Toolset: Matrix B not provided. Control Design Toolset: Matrix A not provided. Control Design Toolset: Different number of columns for matrices R and Q in the Lyapunov equation. Control Design Toolset: Different number of rows for matrices P and Q in the Lyapunov equation. Control Design Toolset: Matrix R is not square in the Lyapunov equation. Control Design Toolset: Matrix P is not square in the Lyapunov equation. Control Design Toolset: Ackermann valid for single-output only. Control Design Toolset: The system model is not single-output. Control Design Toolset: The system model is not single-input. Control Design Toolset: The number of rows in D is not equal to the number of outputs. Control Design Toolset: The number of columns in D is not equal to the number of inputs Control Design Toolset: The number of columns in the regulator gain K does not equal the number of states. Control Design Toolset: The number of row in the regulator gain K does not equal the number of inputs. Control Design Toolset: N rows not equal to Nw. Control Design Toolset: The number of columns in N is not equal to the number of outputs. Control Design Toolset: The dimensions of R are not equal to number of outputs in the system model. Control Design Toolset: The number of rows in N is not equal to number of outputs. Control Design Toolset: A is ill-conditioned. You cannot calculate its inverse. Control Design Toolset: The system model is marginally stable. Control Design Toolset: The system model is not stable Control Design Toolset: The system model is not controllable or observable. Control Design Toolset: The number of rows in H is not equal to the number of outputs. Control Design Toolset: The number of rows in G does not equal the number of states in the system model. Control Design Toolset: G columns not equal to H columns. Control Design Toolset: The dimensions of Q is not equal to the dimension of the process noise. Control Design Toolset: The dimensions of Q do not equal the number of outputs. Control Design Toolset: Compound noise matrix is not positive semi-definite. Control Design Toolset: The noise covariance matrix is not positive definite. Control Design Toolset: The number of columns of the Kalman gain, L, is not equal to the number of outputs in the system model. Control Design Toolset: The number of rows of the Kalman gain, L, is not equal to the number of states in the system model. Control Design Toolset: The sampling time number is not the same. Control Design Toolset: The Hamiltonian matrix is not square. Control Design Toolset: The system model is not observable. Control Design Toolset: The number of columns in N is not equal to the number of inputs/number of columns of B. Control Design Toolset: The number of rows in N is not equal to the number of states/dimensions of A. Control Design Toolset: Matrix R is not square. Control Design Toolset: R is not positive definite or has a dimension different from the number of inputs. Control Design Toolset: Matrix Q is not square. Control Design Toolset: The dimensions of Q are not equal to the dimensions of A, which also are the number of states. Control Design Toolset: The number of columns in C is not equal to number of states. Control Design Toolset: Matrix A is not square. Control Design Toolset: The system model is not controllable. Control Design Toolset: The number of closed-loop poles does not equal the number of columns in matrix A. Control Design Toolset: Ackermann valid for single-input only Control Design Toolset: The number of rows in B is not equal to the dimensions of A, which also are the number of states. Control Design Toolset: Not a complex conjugate pair. Control Design Toolset: Matrix Q not provided. Control Design Toolset: The pair (Ahat,B1) is not stabilizable. Control Design Toolset: The pair (C1, Ahat) is not detectable. Control Design Toolset: Nbar is not valid because the matrix [Qbar - Nbar.inv(Rbar).Nbar'] is not positive semi-definite. Control Design Toolset: Rbar is not positive definite. Control Design Toolset: The R matrix is not positive semi-definite. Control Design Toolset: The number of the final constrains does not match the number of variables. Control Design Toolset: The number of the initial constrains does not match the number of variables. Control Design Toolset: The size of the weight factor vector does not correspond to the weighting matrix. Control Design Toolset: A non square weight matrix has been specified Control Design Toolset: The dimension of the input change weight matrix does not match the number of inputs. Control Design Toolset: The dimension of the input weight matrix does not match the number of inputs. Control Design Toolset: The dimension of the output weight matrix does not match the number of outputs. Control Design Toolset: The initial condition data does not match the dimension of the system matrices. Control Design Toolset: The input frequency vector must be greater than zero. Control Design Toolset: The closed-loop transfer function cannot be calculated. Control Design Toolset: The initial condition vector does not match the number of outputs in the system model. Control Design Toolset: The size of the time vector is too large. Control Design Toolset: The initial frequency is greater than the final frequency. The initial frequency must be less than the final frequency. Control Design Toolset: The initial gain must be less than the final gain. Control Design Toolset: dB drop has to be negative. Control Design Toolset: The size of the frequencies vector and response vector is not equal. Control Design Toolset: The interpolation frequency does not lie within the range of the frequencies. Control Design Toolset: The Gaussian White Noise matrix must have same rows as number of inputs to the system. Control Design Toolset: The system model has infinite covariance due to direct feedthrough. Control Design Toolset: The state covariance matrix has negative eigenvalues. Control Design Toolset: Number of applied inputs does not match with number of inputs in system model. Control Design Toolset: The number of initial states do not match the number of states of the system model. Control Design Toolset: All waveforms must have the same dt and t0. Control Design Toolset: The time step (dt) and sampling time of the discrete system model must be equal. Control Design Toolset: The time step (dt) must be less than the final time (tf). Control Design Toolset: The time Step (dt) must be greater than zero. Control Design Toolset: The initial time (t0) must be greater than or equal to zero. Control Design Toolset: The final time (tf) must be greater than the initial time (t0) Control Design Toolset: Input system model must be a single-input single-output (SISO) model. Control Design Toolset: Overflow in matrix exponential calculation. Control Design Toolset: Model has discrete poles at zero. Control Design Toolset: Model has a pole at 1 with multiplicity greater than 6. Control Design Toolset: Model has a negative real pole with multiplicity greater than 2. Control Design Toolset: Sampling time must be positive. Control Design Toolset: There is a repeated connection between interconnected models. Control Design Toolset: The system model must be proper to perform this function. Control Design Toolset: The system model has a delay. Control Design Toolset: The system model has a transport delay. Control Design Toolset: The system model has an output delay. Control Design Toolset: The system model has an input delay. Control Design Toolset: Not a second order system model. Control Design Toolset: The system model is not square. Control Design Toolset: All variable names must begin with alphabetical letters. Control Design Toolset: The sampling time for this transformation produces an ill-conditioned system model. Control Design Toolset: The frequency must be greater than zero. Control Design Toolset: The order of the polynomial must be larger than zero. Control Design Toolset: The system model must be continuous. Control Design Toolset: The system model must be discrete. Control Design Toolset: The dimension of output delay vector does not equal the number of outputs of the system model. Control Design Toolset: The dimension of the input delay does not equal the number of inputs of the system model. Control Design Toolset: The dimensions of the input/output delay matrices must equal the number of inputs and outputs of the system model. Control Design Toolset: The delay in the discrete system model must be an integer. Control Design Toolset: The number of inputs or outputs exceeds the total inputs or outputs of system model. Control Design Toolset: The number of outputs of the existing system model does not equal the number of outputs of the supplied system model. Control Design Toolset: The number of inputs of the existing system model does not equal the number of inputs of the new system model. Control Design Toolset: The number of states of the existing system model does not equal the number of states of the supplied system model. Control Design Toolset: The system model is discrete. Control Design Toolset: Sampling time cannot be negative. Control Design Toolset: This VI does not support system models with delays. The delay information was ignored. Control Design Toolset: The system model has a transport delay. Control Design Toolset: The system model has an input delay. Control Design Toolset: The system model has an output delay. Control Design Toolset: The delay information was ignored. Control Design Toolset: The system model is not proper. Control Design Toolset: Fractional delays in the discretization process were ignored. Control Design Toolset: Second connector ignored. Control Design Toolset: Could not distribute all the components of the transport delay matrix. Control Design Toolset: Results may be inaccurate. Try a different method. Control Design Toolset: Converting the stable continuous model resulted in an unstable discrete-equivalent model. Control Design Toolset: Converting the stable discrete model resulted in an unstable continuous-equivalent model. Control Design Toolset: Phase margin is infinite. Control Design Toolset: Gain margin is infinite. Control Design Toolset: Magnitude does not drop below given dB value. Control Design Toolset: The actual final time (tf) is different from the supplied value. Control Design Toolset: The 2-norm is infinite since the system model is not stable Control Design Toolset: The infinity norm is infinite because system model is marginally stable. Control Design Toolset: Roots for large gain values were not plotted. Control Design Toolset: The final frequency was reduced to equal the Nyquist frequeny of discrete system model. Control Design Toolset: The given step time (dt) and vector size limitations caused a reduction in the final time from its ideal value. Control Design Toolset: The time step (dt) is not ideal. Control Design Toolset: Initial conditions were ignored. Control Design Toolset: Initial conditions were ignored. Control Design Toolset: The system model has infinite covariance due to direct feedthrough. Control Design Toolset: The matrices Q and/or R are close to zero norm. Control Design Toolset: The system model has no specified states. Control Design Toolset: The system model has no specified inputs. Control Design Toolset: The system model has no specified outputs. Control Design Toolset: Measured outputs and known/manipulated inputs ignored. Control Design Toolset: User defined Threshold has been surpassed. Pole placement could not place the poles in the requested location. Control Design Toolset: Removed residue from the denominator. Control Design Toolset: Invalid inputs or outputs were ignored in producing the plots.