MATLAB: Matlab doesn’t recognise the function dtf

helpMATLABMATLAB and Simulink Student Suitematlab function

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)')

Best Answer

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);
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