Matlab doesn't recognise the function dtf

Hey guys,

MATLAB doesn't seem to recognise the function dtf, any ideas on what to do? This is my code so far.

Any help would be amazing.

Annabell

n = [0:1:99]; 
x = cos(0.48*pi*n)+cos(0.52*pi*n);
n1 = [0:1:9];
y1 = x(1:1:10);
subplot(2,1,1);
stem(n1,y1); 
title('signal x(n), 0 <= n <= 9');
xlabel('n')

Y1 = dft(y1,10); 
magY1 = abs(Y1(1:1:6));
k1 = 0:1:5;
w1 = 2*pi/10*k1;
subplot(2,1,2);
stem(w1/pi,magY1);
title('DTFT Magnitude');
xlabel('frequency (pi)')

Answer 1

[Ameer Hamza]

In MATLAB, DFT of a signal can be calculated using fft() function: https://www.mathworks.com/help/matlab/ref/fft.html. FFT is an efficient algorithm to calculate DFT.

Y1 = fft(y1,10); 

[Annabell Bennett]

Worked perfectly.

Thank you!