How can I create a 3D matrix with values every 3rd/6th/9th row?

How can I make my 3d city have rows every 3rd/6th/9th row?

% Create the height of your buildings
A=rand(11,11)

% Make roads have 0 height
A(3,1:11)=0
A(6,1:11)=0
A(9,1:11)=0

% Make roads have 0 height
A(1,11:3)=0
A(1,11:6)=0
A(1,11:9)=0

[Youssef Khmou]

hi, i suggest that you change the title of your question, and make it a bit professional even for numerical drawing, so as to get responses from professionals .

[Image Analyst]

Then change the body so that people can understand what you want to do. For example, what does "have rows every 3rd/6th/9th row" mean???? Evidently from your code you meant "have zeros every 3rd row". Did you proofread your question before you posted it?

Finally learn to format your code. Highlight your code, then click the {}Code icon above the text box.

By the way, your new subject line "3D model I ling" makes as little sense as your last one. What is a "ling"?

[Jan]

How annoying - another deleting of the question. Sean, the frequent contributor will loose the interest in answering your questions, if you invalidate the threads afterwards. This is a destructive behavior in a public forum.

[Randy Souza]

I have restored the original text of this question.

Sean, this question may be valuable to someone else in the future. If you have a good reason why it should be removed from MATLAB Answers, please flag the question, explain why it should be deleted, and an administrator or high-reputation contributor will consider deleting the question. Please do not simply edit your question away.

Answer 1

[Youssef Khmou]

hi, for the second time ,re-write your question, anyway based on your non organized question, here is what you ask for :

 N=11;
 a=rand(N);
 for i=1:N
  if mod(i,3)==0
  a(i,:)=0;
 end 
 end

But this is not what you wanted, you wanted when surfing the matrix a , to see "parallelepipeds" as buildings , you repost the question with proper description .

Answer 2

[Youssef Khmou]

 clc,
close all
N=11;

 a=rand(N);
 for i=1:N
  if mod(i,3)==0
  a(i,:)=0;
  a(:,i)=0;
 end 
 end
 fprintf(' Original city :\n');
 a
 figure, surf(a), colormap gray, view(-36,86), axis off
 fprintf('\n after years of civilization , the city became  :\n')
 building=ones(20);

 b=kron(a,building);
 b(1,:)=0;
 b(:,1)=0;
 b(end,:)=0;
 b(:,end)=0;
 figure, surf(b,'AmbientStrength',0.85),  xlabel(' Streets');
 ylabel(' Streets'), title(' Sean''s CITY'), axis off,view(93,4)