Error: The "A" matrix must be a numeric array with no Inf's or NaN's.

coder.extrinsic("testcon2dis")
I_2 = eye(2);
O_2 = zeros(2);
Ac_xy = [O_2 -(1/Lfilter)*I_2 O_2; (1/Cfilter)*I_2 O_2 -(1/Cfilter)*I_2; O_2 O_2 w* J];
Bc_xy = [(Vdc/Lfilter)*I_2 O_2 O_2]' * Tr;
Cxy = [I_2 O_2 O_2; O_2 I_2 O_2];
[A, B] = testcon2dis(Ac_xy, Bc_xy, Cxy, Ts);

%%%%%%%%%%%%%%%% Below is the testcon2dis%%%%%%%%%%%%%%%%
function[A,B] = testcon2dis(Ac_xy,Bc_xy,Cxy,Ts)
ct_sys = ss(Ac_xy,Bc_xy,Cxy,[]);
dt_sys = c2d(ct_sys,Ts);
A = dt_sys.a;
B = dt_sys.b;
end  

%%%%%%%%%%%%%%%%%%%%%%% Error message

Error:The "A" matrix must be a numeric array with no Inf's or NaN's.

Error in ss.ss.m (line 290)

throw(ME)

Error in testcon2dis.m (line 2)

Error in 'MPC_3Phase_Inverter/MATLAB Function1' (line 31)

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Any suggestions I tried calling the A marix as a double or zeros to give it sizes but still got new errors doesn't work(this block of code is used in a matlab function block simulink)

%%%%%%%%%%%%%%%%%%%%% Error message calling A as a double or zeros(6,6)%%%%%%%%%%%%%%%

Warning: Matrix is singular, close to singular or badly scaled. Results may be inaccurate. RCOND = NaN.

> In MPC_Matrices_l (line 69)

Error:Matrix must be positive definite.

Error in MPC_Matrices_l.m (line 70)

Hinv=chol(W_inv);

Error in 'MPC_3Phase_Inverter/MATLAB Function1' (line 43)

Any suggestions thank you

[Tony]

It seems some values in Ac_x might be Inf or NaN. Are Lfilter and Cfilter non-zero? Check w and J too.

[Manikanta Aditya]

• Make sure that the matrices Ac_xy, Bc_xy, and Cxy are correctly defined and do not contain any Inf or NaN values. You can use the isfinite function in MATLAB to check for Inf and NaN values.
• Ensure that the dimensions of Ac_xy, Bc_xy, and Cxy match the expected dimensions. Mismatched dimensions can often lead to unexpected results or errors.

[Sam Chak]

Code looks okay. Check other parameters that are not shown.

%% parameters
I_2     = eye(2);
O_2     = zeros(2);
Lfilter = 1;            % not shown
Cfilter = 1;            % not shown
w       = 1;            % not shown
J       = eye(2);       % not shown
Tr      = 1;            % not shown
Vdc     = 1;            % not shown

%% state-space matrices
Ac_xy   = [O_2 -(1/Lfilter)*I_2 O_2; (1/Cfilter)*I_2 O_2 -(1/Cfilter)*I_2; O_2 O_2 w* J];
Bc_xy   = [(Vdc/Lfilter)*I_2 O_2 O_2]'*Tr;
Cxy     = [I_2 O_2 O_2; O_2 I_2 O_2];
Ts      = 0.1;

%% Test function
[A, B]  = testcon2dis(Ac_xy, Bc_xy, Cxy, Ts)

A = 6x6

0.9950 0 -0.0998 0 0.0052 0 0 0.9950 0 -0.0998 0 0.0052 0.0998 0 0.9950 0 -0.1050 0 0 0.0998 0 0.9950 0 -0.1050 0 0 0 0 1.1052 0 0 0 0 0 0 1.1052

<mw-icon class=""></mw-icon>

<mw-icon class=""></mw-icon>

B = 6x2

0.0998 0 0 0.0998 0.0050 0 0 0.0050 0 0 0 0

<mw-icon class=""></mw-icon>

<mw-icon class=""></mw-icon>

function [A, B] = testcon2dis(Ac_xy, Bc_xy, Cxy, Ts)
    ct_sys  = ss(Ac_xy,Bc_xy,Cxy,[]);
    dt_sys  = c2d(ct_sys,Ts);
    A       = dt_sys.a;
    B       = dt_sys.b;
end 

[Joseph]

Thank your the comment, I realise the error message genrated by the matlab didnt point exactly to the error. I realise the issue is with the AC_xy matrix which from the other sugegstion I was told to use the isany nan command to resolve it.

Answer 1

[Kalhara]

% Check for NaNs

any(isnan(A(:)))

% Check for infinite values

any(isinf(A(:)))

A(isnan(A)) = 0; % Replace NaNs with zeros