MATLAB: Problem with function sinc

errorMATLABmatlab functionsinc

hello everyone

i have a problem with the function sinc (i'm not so expert i started to use mathlab 3 months ago) and i wrote this:

x = 0:pi/100:2*pi;

y=sinc(x);

but i have an error:

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

someone can help me? thanks

Adapt its formula as follows:

x = 0:pi/100:2*pi;
y=sin(pi*x)./(pi*x);%sinc function
plot(y)

How about just using sinc() if you have the Signal Processing Toolbox.

If not

   x = linspace(-5,5);
   y = sin(pi*x)./(pi*x);
   y(x==0) = 1;
   plot(x,y)

Sounds like you're using a pi-normalized sinc

      >> sin(1.5*pi)/(1.5*pi)
    ans =
       -0.2122

It's a normalization often used so that the roots of the sinc() will be at the integers.