NO GRAPH IN MY FIGURE PLOTTING (designing a highpass FIR with blackman windowing)

%group 6

%Joshua Yoshihiko, Nadhila Hanan, Atya Saniah

clc;

clear all;

close all;

%input audio file with format: *.wav

%=========

[samAud,samRate]=audioread('bayi.wav');

N=1024;

f=0:samRate/(N/2-1):samRate;

samAud_fft = fft(samAud,N);

%=========

%plot audio file in time domain

%=========

figure (1)

plot(samAud);

%=========

%plot audio file in frequency domain

%=========

figure (2)

plot (f,abs(samAud_fft(1:N/2))/max(abs(samAud_fft(1:N/2))));

%=========

%Design FIR filter

%start here

fc=2000;

M=100;

n=0:1:M;

%write the desired/reference filter function

hd=(sinc(n-M/2)-(fc/samRate)*(sinc((fc/samRate)*(n-M/2))));

%write code for window method you use

wn=0.42-0.5*(cos(2*pi*(n/M)))+0.08*(cos(4*pi*(n/M)));

%write the designed filter function

hn=hd.*wn;

%apply filter to the audio file

samAud_filtered=conv(samAud,hn);

samAud_fft_filtered=fft(samAud_filtered,N);

%plot filtered audio file in time domain

figure (3)

plot(samAud_filtered);

%plot filtered audio file in frequency domain

figure (4)

plot(f,abs(samAud_fft_filtered(1:1:N/2))/max(abs(samAud_fft_filtered(1:1:N/2))));

%end here

[Joshua Tampubolon]

can annyone help me with troubleshooting this program?