Undefined sin_function_sf

%Using a script file (I)
clear;
format short g
%plot of sin with interval from [-pi,pi]
N=100;
x=linspace(-pi,pi,N)'
y=sin(x)
figure(1)
plot(x,y)
sf = 0.1
y = sin_scale(x,sf);
figure(2),
plot(x,y)
sf=[0.1 0.5 2]; 
N_sf = numel(sf);
sin_array = zeros(N,N_sf);
for ndx = 1: N_sf
sin_array(:,ndx) = sin_function_sf(x,sf(ndx));
end
figure(3),
plot(x,sin_array)
title(['A Sine fn; limits = [-pi pi]; Scale factors = ',num2str(sf)])

here is the code please, check this, and help me

[KSSV]

The function is not an inbuilt function.....if you have downloaded it from somewhere, copy those functions and save. If the functions are present see to it that they are present in the same working folder.

[Zubair Ghafoor]

is it a function? which I am mission or it a varriable.?

[KSSV]

Clearly thet are functions.

sin_scale, sin_function_sf

[Zubair Ghafoor]

no but i am not getting it.

[Walter Roberson]

sin_scale = @(x,sf) sin(x) * sf;
sin_function_sf = sin_scale;

[Zubair Ghafoor]

Yes that's the right answer..

I have done the same thing and got the output