How can I change the radius of the spiral so it varies along the length from 0 to 1?

How can I change the radius of the spiral so it varies along the length from 0 to 1?

y=0:0.5:100; 
n=length(y); 
x=cos(y/100*10*pi);
z=sin(y/100*10*pi); 
X=[zeros(1,n);x]; 
Y=[y;y]; 
Z=[zeros(1,n);z]; 
surf(X,Y,Z); 
alpha(0.5); 
view(75,15); 

Answer 1

[Star Strider]

Change ‘x’ and ‘z’ to:

x=cos(y/100*10*pi).*(y/100);
z=sin(y/100*10*pi).*(y/100);

so the full code siis now:

y=0:0.5:100; 
n=length(y); 
x=cos(y/100*10*pi).*(y/100);
z=sin(y/100*10*pi).*(y/100); 
X=[zeros(1,n);x]; 
Y=[y;y]; 
Z=[zeros(1,n);z]; 
surf(X,Y,Z); 
alpha(0.5); 
view(75,15)

.

[Mara Pereira]

thank u!

[Star Strider]

As always, my pleasure!