Creating a Helix Spiral

I want to create a helix sprial. I wish to have control over changing the radius of the spiral, the gap between each layer and the height of the spiral. How would I do that?

I obtained the code below from MATLAB's Documentation however I am not familiar with it. If you can explain how st and ct works that would be helpful too.

Thanks in advance

clc; clear; close all
t = 0:pi/50:10*pi;
st = sin(t);
ct = cos(t);
plot3(st,ct,t)
grid on

Answer 1

[Bruno Luong]

r = ...
gap = ...

t = (2*pi/gap)*(0:0.001:10);
st = r*sin(t);
ct = r*cos(t);

[Hans123]

Thanks for the quick answer, Bruno. Appreciate it

However I am still confused over the how to change the height of the spiral (black) vs. changing the layer height (blue). Hope the image below helps you understand my problem

[Bruno Luong]

For

t = (2*pi/gap)*(0:0.001:10)

The blue distance is "gap"

The black distance is 2*pi*10/gap

[Hans123]

If I want to make the height (black line) be independent of the gap, how would I change the code?

Because I have 3 user requested variables - Radius, Gap, Height

Thanks for the reply

[Bruno Luong]

gap=5     % blue distance
d=30      % black distance
r = 2;

z=linspace(0,d,1000);
t=(2*pi/gap)*z;

x=r*cos(t)
y=r*sin(t)
plot3(x,y,z)

[Hans123]

works exactly as I want it to, thank you for the help!