I have written this function for the sine wave that takes different values of frequency(f0)and sampling frequency(fs) Can anyone help where I am doing wrong.

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Aash 2017-10-28

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评论： Walter Roberson 2017-10-29

 function y= sin_f(length,amplitude,Frequency,phaseShift)
N=length;
f0 =Frequency;
phi= phaseShift;
A=amplitude;
y=zeros(1,N+1);
for n=1:N+1
    y(n)=A*sin(2* pi* f0 * (n-1)+ phi);
end
N=40; % Number of samples
A=1.5;    % Amplitude
k=1;    % for subplot
phi =pi/2;    % for phase angle
fs = 44000
x=[0:1:N];
m = [0, 0.05, 0.1,0.4,0.45,0.5,0.55,0.6]
%m=[0 .1 .2 .8 .9 1 1.1 1.2];
r=floor(length(m)/2);
for i= m
 f0=m
y= sin_f(N,A,f0,phi);
figure(1)
subplot(r+1,2,k);
stem(x,y);
xlabel('Time Index n');
ylabel('Amplititude');
title(m(k));
k=k+1;
end

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Walter Roberson 2017-10-29

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You tried to use length as the name of a parameter and also as the function that it more commonly represents.

Your code has no comments about what sizes are expected for the parameters, and does no checking; your code just crashes for no good reason if the user passes something non-scalar.

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Aash 2017-10-29

so u mean i should change name of N= length in the function? if its so then why is it working for angular frequency?

Walter Roberson 2017-10-29

N is not the problem. The problem is "length". You should avoid using variable names that are the same as MATLAB functions, because you will tend to forget that they are variables at the time you need the function.

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