How do I write the following functions on Matlab x(t) = 2tcos(pi*t) , y(t) = 2sin(pi*t)

I keep getting error using * and other errors

[Steven Lord]

These functions didn't exist when the question was originally asked (they were introduced in release R2018b) but the sinpi and cospi functions may be of use.

Answer 1

[KSSV]

t = 0:0.1:60 ;
x = 2*t.*cos(pi*t) ;
y = 2*sin(pi*t) ;

[Khalid Tewfik]

this is what I have t = 0:.1:2; x1 = 2*t.*cos(pi*t); y1 = 2*sin(pi*t); plot(x1,y1) but i'm still getting the error message Error using * Inner matrix dimensions must agree.

Error in plotting (line 8) x1 = 2*t*cos(pi*t);

[KSSV]

It should work.....you clear space and try..

Answer 2

[Adam]

t = linspace( 0, 2*pi, 100 );
x = 2 * t .* cos( pi * t );
y = 2 * sin( pi * t );

[Khalid Tewfik]

this is what I have t = 0:.1:2; x1 = 2*t.*cos(pi*t); y1 = 2*sin(pi*t); plot(x1,y1) but i'm still getting the error message Error using * Inner matrix dimensions must agree.

Error in plotting (line 8) x1 = 2*t*cos(pi*t);

[John D'Errico]

@Khalid Tewfik - too late for this response for you, but you need to see that you used the expression:

2*t*cos(pi*t)

Do you see you used the * operator, instead of the .* operator? The difference if important in MATLAB.

Answer 3

[MD.AL-AMIN]

% Define the signal function
X = @(t) 5 * sin(2*pi*t) .* cos(pi*t - 8);

% Define the range of t
t = linspace(0, 20, 1000); % Adjust the number of points for desired resolution

% Plot the signal
figure;
plot(t, X(t));

% Label axes and title
xlabel('t');
ylabel('X(t)');
title('Signal X(t)');

% Adjust axis limits and grid (optional)
xlim([0, 20]); % Set appropriate x-axis limits
ylim([-5, 5]); % Set appropriate y-axis limits
grid on;