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# how i can generate random points inside a cube?

Asked by ziba on 25 Sep 2012
Latest activity Answered by humaira akber on 15 Dec 2013

i want to generate rondom points inside a cube.

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Answer by Wayne King on 25 Sep 2012
Edited by Wayne King on 25 Sep 2012

You can use rand()

` Z = rand(10,10,10);`

The above gives you the unit cube. You can translate this and scale the side length:

` Z = 2+(4-2)*rand(10,10,10);`

## 1 Comment

Chris Argy on 12 Jul 2013

Hi Wayne, I would understand

```Z= rand(n,n,3);
```

which could be plotted using

```plot3(Z(:,:,1),Z(:,:,2),Z(:,:,3),'k.')
```

Each point would then have 3 random coordinates. How would Z = rand(10,10,10) work and how would the coordinates be assigned?

Answer by humaira akber on 15 Dec 2013

npx=12; % no. of NPs on x-axis npy=12; % no. of NPs on y-axis npz=12;

dx=1; % distance b/w two NPs on x-axis dy=1; % distance b/w two NPs on y-axis dz=1;

x(1)=dx; % first particle is at dx from y-axis y(1)=dy; % first particle is at dx from x-axis z(1)=dz; np=0; x=zeros(1,npx); for k=1:npx x(k)=k*dx; y=zeros(1,npy); for l=1:npy y(l)=l*dy; z=zeros(1,npz); for m=1:npz z(m)=m*dz; end

```    end
end
np=npx*npy*npz
sir how to plot cube by using this assembly please give me answer as earlier as you can please.will be waiting```