MATLAB: How to convert 1D matrix to 3D matrix with specific order.

1d3dmatrixreshape

I have a 1D matrix (1 by 6,000,000) of data. I want to reshape this to a three dimensional matrix that is 100 by 100 by 600. However, when I use the reshape function, the order of the numbers comes out incorrect.
For example: (12 numbers)
a=
 0.01
 0.02
 0.03
 0.04
 0.05
 0.06
 0.07
 0.08
 0.09
 0.10
 0.11
 0.12
I want b to be: (assume 2 by 2 by 3)
b(:,:,1)=
         0.01    0.07
         0.04    0.10
b(:,:,2)=
         0.02    0.08
         0.05    0.11
b(:,:,3)=
          0.03    0.09
          0.06    0.12
Basically, the order that I want is if the x axis had 2 points, y axis had 3 points, and z axis had 2 points, Point 1 would be (x1, y1, z1), Point 2 would be (x1, y1, z2), Point 3 would be (x2, y1, z1), Point 4 would be (x2,y1,z2), Point 5 would be (x1, y2, z1), Point 6 would be (x1, y2,z2), Point 7 would be (x2,y2,z1), Point 8 would be (x2,y2,z2) and on to Point 12.
What is the most efficient way to do this?
Thank you.

Best Answer

a=0.01:0.01:0.60
%you want a nxmxp matrix with:
n=3
m=4
p=5
out=permute(reshape(a,p,n,m),[2,3,1])
You can apply this to your case 2x2x3 matrice
a=0.01:0.01:0.12
n=2
m=2
p=3
out=permute(reshape(a,p,n,m),[2,3,1])
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