Using continous time in Matlab editor

In the code below, I need to use continous time to generate phi. I want to achieve this in MATLAB editor. I can do this in Simulink using simulink clock block. I want the time t in the editor's script to emulate the clock's block time. Kindly help.

V1 = 18;                                % Input voltage
R = 7.2;                                 % Load resistance
a = 0 * (2*pi/360);                % pulse shift angle (rad)
fs = 70000;                             % Switching frequency 
phi = pi* ((31*2/360) - (0.028*sin(2*pi*t))));            % Phase shift (pi.d in rad) & t is time 

Answer 1

[Walter Roberson]

Pi = sym(pi);
syms t
phi = Pi * ((31*2/360) - (0.028*sin(2*Pi*t)))            % Phase shift (pi.d in rad) & t is time 

phi = 

phi is expressed in continuous time t

I have to wonder whether your actual equation is

phi = Pi * ((31*2/360)) - (0.028*sin(2*Pi*t))

phi = 

fplot(phi, [0 10])

[Olutayo Omotoso]

Thanks you for your help

Answer 2

[Alexander]

Maybe something simple like that:

V1 = 18; % Input voltage

R = 7.2; % Load resistance

t = 0:0.001:3*pi;

a = 0 * (2*pi/360); % pulse shift angle (rad)

fs = 70000; % Switching frequency

phi = pi* ((31*2/360) - (0.028*sin(2*pi*t))); % Phase shift (pi.d in rad) & t is time

plot(t,phi)

[Walter Roberson]

t = 0:0.001:3*pi;

That is discrete time, not continuous time.

[Alexander]

Yes of cause. It depends of what you are expecting.

[Alexander]

If forgotten a remark. If fs is the sample frequency just replace 0.001 by 1/70000.

Answer 3

[Olutayo Omotoso]

Thanks you all for your help