Getting Error Codes, not exactly sure what they mean or how to fix them, please help

% Define circuit parameters
Vin_rms = 120; % V 
Vout = 2.4; % V 
Iload = 25e-3; % A 
Vripple = 0.12; % V 
R2 = 1e3; % Ohm 
C = 47e-6; % F 
R1 = (Vin_rms/sqrt(2) - Vout - 0.7) / 0.7 * R2; % Ohm
% Simulate circuit
tspan = [0 0.02]; 
opts = odeset('RelTol',1e-6); 
[t,x] = ode45(@(t,x) dc_power_supply(t,x,Vin_rms,Vout,Iload,R1,R2,C), tspan, [0 0], opts);
% Plot results
figure 
subplot(2,1,1) 
plot(t,x(:,1)) 
xlabel('Time (s)') 
ylabel('Voltage (V)') 
title('Input Voltage') 
grid on 
subplot(2,1,2) 
plot(t,x(:,2)) 
xlabel('Time (s)') 
ylabel('Voltage (V)') 
title('Output Voltage') 
grid on
function dxdt = dc_power_supply(t,x,Vin_rms,Vout,Iload,R1,R2,C)
% Define circuit equations
dxdt(1) = sqrt(2) * Vin_rms * sin(2pi60*t) - x(1) / R1; 

Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.

dxdt(2) = (x(1) / R1 - x(2) / R2 - 0.7) / (C * R2 * 2 * pi * 60) - Iload / C; 
dxdt = dxdt'; 
end

Answer 1

[Torsten]

% Define circuit parameters

Vin_rms = 120; % V 
Vout = 2.4; % V 
Iload = 25e-3; % A 
Vripple = 0.12; % V 
R2 = 1e3; % Ohm 
C = 47e-6; % F 
R1 = (Vin_rms/sqrt(2) - Vout - 0.7) / 0.7 * R2; % Ohm

% Simulate circuit

tspan = [0 0.02]; 
opts = odeset('RelTol',1e-6); 
[t,x] = ode45(@(t,x) dc_power_supply(t,x,Vin_rms,Vout,Iload,R1,R2,C), tspan, [0 0], opts);


% Plot results


figure 
subplot(2,1,1) 
plot(t,x(:,1)) 
xlabel('Time (s)') 
ylabel('Voltage (V)') 
title('Input Voltage') 
grid on 

subplot(2,1,2) 
plot(t,x(:,2)) 
xlabel('Time (s)') 
ylabel('Voltage (V)') 
title('Output Voltage') 
grid on

function dxdt = dc_power_supply(t,x,Vin_rms,Vout,Iload,R1,R2,C)

  % Define circuit equations

  dxdt(1) = sqrt(2) * Vin_rms * sin(2*pi*60*t) - x(1) / R1; 
  dxdt(2) = (x(1) / R1 - x(2) / R2 - 0.7) / (C * R2 * 2 * pi * 60) - Iload / C; 
  dxdt = dxdt'; 
end

[Travis]

Im still getting the same error codes, not sure if maybe I'm missing a toolbox or something.

I'm copying and pasting this code exactly, this is the error code I'm getting:

Undefined function 'dc_power_supply' for input arguments of type 'double'.

Error in @(t,x)dc_power_supply(t,x,Vin_rms,Vout,Iload,R1,R2,C)

Error in odearguments (line 92)

f0 = ode(t0,y0,args{:}); % ODE15I sets args{1} to yp0.

Error in ode45 (line 107)

odearguments(odeIsFuncHandle,odeTreatAsMFile, solver_name, ode, tspan, y0, options, varargin);

[Torsten]

I don't know. You don't miss a toolbox. Maybe you mix doubles and symbolic variables somewhere somehow.