Creatng Array code using randperm function

Creatng Array code using randperm function

I’ve created the Array code using randperm function.

I would like to improve some part.

My question is how to add the additional conditions?

<Previous conditions>

1. There are 1000 elements (x=10 elements, y=10 elements, z=10 elements / cubic shape)
2. I assigned that the 20% of elements are ‘2’ (Material number)
3. I assigned that the 80% of elements are ‘1’ (Material number)
4. Each position is the center of the elements

<array>

<Additional conditions>

1. When the position of x = 4~7, y=4~7 and z=7 (holes), the material number is ‘3’.
2. The 20% of elements except for the holes is ‘2’ (Material number)
3. The 80% of elements except for the holes is ‘1’ (Material number)

<previous code>

clc; clear; close all 
n = 1000; p = randperm(n); array = zeros(n,1);
Vf = 0.2;
Num = Vf*n;

%% Input
Xlength = 0.5;
Ylength = 0.5;
Zlength = 0.5;


XNum = 10;
YNum = 10;
ZNum = 10;

Xmin = -0*Xlength/2;
Ymin = -1*Ylength/2;
Zmin = -1*Zlength/2;

X = -0.25; Y = -0.25; Z = -0.25;
for i=1:XNum   
    Xnew = X+Xlength;
    X = Xnew;
    Xoriginal(i) = X;
end

for i=1:YNum   
    Ynew = Y+Ylength;
    Y = Ynew;
    Yoriginal(i) = Y;
end

for i=1:ZNum   
    Znew = Z+Zlength;
    Z = Znew;
    Zoriginal(i) = Z;
end

for i = 1:Num
    array(p(i)) = 10e9;    
end

[X,Y,Z] = meshgrid(Xoriginal,Yoriginal,Zoriginal);
X = X(:);
Y = Y(:);
Z = Z(:);
POS = [X Y Z array];
SzPOS = size(POS);

[KSSV]

What is the question now?

[Jonghyun Kim]

I wonder how to make the code with additional condition 'number 1=

When the position of x = 4~7, y=4~7 and z=7 (holes), the material number is ‘3’.'