How can I create a 3D matrix?

I got three matrix,

num1=linspace(0,1,100);
num2=linspace(0,1,100);
num3=linspace(0,1,100);

how can combine them together to become a 3D matrix ? (formed like below)

(or maybe what I want doesnt called a 3D matrix)?

w is the final matrix i wanted.

>> w(1,1,1)
ans = 0  0  0
>> w(2,1,1)
ans = 0.01  0  0
>> w(100,1,1)
ans = 1  0  0
>> w(2,1,2)
ans = 0.01  0  0.01
>> w(:,1,1)
ans = 0  0  0
 0.01  0  0
 0.02  0  0
 0.03  0  0
 ...

Or maybe what I want doesnt called a 3D matrix? Any function or keyword I can look up for?

Answer 1

[KALYAN ACHARJYA]

mat_3d=rand(rows_num,columns_mum,depth);

Here depth represents channel number/number of plane slices

Your query ('how can combine them together to become a 3D matrix ?')

num1=linspace(0,1,100);
num2=linspace(0,1,100);
num3=linspace(0,1,100);
result=cat(3,num1,num2,num3);

2nd part:

w(1,1,1) 
ans = 0  0  0

For such a case you may look at a multi dimentional cell array for an array stored in a single location. In a multi-dimensional matrix, using w(rows, columns, channel_number) only gives single numeric value. Yes, if you use range numbers or column numbers or ranges of channel numbers, you may get an array as a result.

[chia ching lin]

Thanks for answering. I've consider using cat(3, ) before, but the result wasn't quite what i'm thinking for. I'm expecting that I can call a 1x3 double array from th result.

I'm tyring to built a 256x256x256 RGB color matrix that I can call the color from it. For example red=result(256,0,0), green=result(0,256,0), blue=result(0,0,256).

orange is from result(0,1,2)~result(0,128,256)

[KALYAN ACHARJYA]

"I'm tyring to built a 256x256x256 RGB"

It suppose to have 256 gray planes (Multi dimentional 3 D arrays ), right? Here is the example

result=zeros(256,256,256);
for i=1:256
    result(:,:,i)=rand(256,256);
end 

Check:

>> whos result
  Name          Size                     Bytes  Class     Attributes

  result      256x256x256            134217728  double