Why do I recieve error when doing sinc function

Im trying to plot the sinc function and im given my A and T however when i try to input the equation i get an error

A = 1;

T = 1;

gf= AT sinc(fT);

[Jon]

Please copy and paste the full error message, all of the red text, so we can see what error you are getting.

[Taylor Hayes]

Answer 1

[Jon]

If you want to plot the sinc value for a range of values then you need to pass it a vector of values.

So for example:

x = linspace(-10,10,1000); % defines a vector with a thousand equally spaced points between -10 and 10
y = sinc(x);
plot(x,y)

You will need to modify with your actual values and scaling constants

[Jon]

The plot shown in your figure is of the absolute value of the sinc function. Also it looks like it goes out to x = f/T of about 4 so this would probably look close

x = linspace(-4,4,1000); % defines a vector with a thousand equally spaced points between -10 and 10
y = abs(sinc(x));
plot(x,y)

[Jon]

By the way the error message you are getting is because you didn't have a multiplication operator. You need to have something like:

gf = A*T*sinc(ft)

This would have then given another error, because you have not yet defined ft

[Jon]

If you are still just trying to get the basics of using MATLAB I would suggest completing the MATLAB on-ramp https://www.mathworks.com/learn/tutorials/matlab-onramp.html

Answer 2

[Yusuf Suer Erdem]

Hi, try it this way. That is the way how it should be done. But I could not get the exact waveform. Maybe others could help.

t = linspace(-5,5);
f=1./t;
A=5;
y = A.*t.*sinc(f.*t);
plot(t,y)
grid