Signal Simulink from / to Workspace

Hello, I have this variable called SigData in the workspace that I send to Simulink to the transfer fuction block

My problem is, if I change the cycle of the input to more than one:

I have the following error in Simulink:

clear all

Heart_Rate = 72;          % Heart rate [beats/min] 
Duty = 2/5;               % Fraction of period occupied by systole 
T = 60/Heart_Rate;        % Heart period [s]
Time_Systole = Duty*T;    % Time occupied by systole [s] 
Time_Diastole = T - Time_Systole;
Max_Flow = 500;           %[m^3/s] = 4.98 l/min
Number_Cycles = 1;

r = 0.05;               
C = 1.0666;         
R = 0.9;         
L = 0.0051; 

Q = zeros(Number_Cycles * (int16 (round(T,3)/0.001)), 1); 
aux=1; 

for i = 1:Number_Cycles
    for t = 0.001:0.001:round(T,3)  
          if (t <= Time_Systole)    
              SigData(aux,1) = t;
              Q(aux) = Max_Flow*(sin((pi*t)/Time_Systole))^2; 
              SigData(aux,2)= Q(aux); 
          end 
          
          if (t > Time_Systole) 
              SigData(aux,1)=t;
              Q(aux,2)=0; 
              SigData(aux,2)=Q(aux);
          end
    aux=aux+1; 
    end 
end 

Answer 1

[Fangjun Jiang]

The data in the first column of SigData is the time (or time step) info. It must be incremental (or non-descreasing).

Based on your code, when there is more than one cycle, the time step is constructed as 0.001 to 3, and then 0.001 to 3 again and then 0.001 to 3 again.

Change this line

SigData(aux,1) = t

to SigData(aux,1) = t+(i-1)*round(T,3)

[Rodrigo Vialle]

Thanks! How can I send the output from the transfer fcn from simulink to a variable in the workspace?

[Fangjun Jiang]

Use "To Workspace" block