creating a matrix by a vector in the following condition

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Bahar 2018-2-22

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https://ww2.mathworks.cn/matlabcentral/answers/384321-creating-a-matrix-by-a-vector-in-the-following-condition

回答： SRT HellKitty 2018-2-23

Imagine that there is a vector, such as:

v=[a1; a2; a3; a4; a5; a1; a2; a3; a4; a5; a1; a2; a3; a4; a5; a1; a2; a3; a4; a5; a1; a2; a3; a4; a5;]

I need to rearrange this vector and transfer it to a matrix such that the elements are positioned like the following matrix:

 matrix=
     a1     a2     a3
     a2     a1     a2
     a3     a2     a1
     a4     a3     a2
     a5     a4     a3
     a1     a2     a3
     a2     a1     a2
     a3     a2     a1
     a4     a3     a2
     a5     a4     a3

I need a for loop that creates this matrix. It is like each column starts with the second element of the previous column(e.g.: a2 in column 2) and ends at the one to the last element of the previous column(e.g: a3 at column 3). Also, it happens for each block (a1 to a5).

I could not explain it very well but hopefully, the example makes it clear.

Thanks in advance for your help.

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James Tursa 2018-2-23

编辑：James Tursa 2018-2-23

No, this is not clear. For one, your 3rd column does not seem to satisfy the "starts with the second element of the previous column" rule. And I can't figure out the rule for filling in the in-between elements either. Why do you have to use a for-loop?

Bahar 2018-2-23

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Ok forget what I explained, please just look at the example. the first block of the matrix is:
   a1     a2     a3
   a2     a1     a2
   a3     a2     a1
   a4     a3     a2
   a5     a4     a3
And the second block is the same which adds to the first one.
     a1     a2     a3
     a2     a1     a2
     a3     a2     a1
     a4     a3     a2
     a5     a4     a3
     a1     a2     a3
     a2     a1     a2
     a3     a2     a1
     a4     a3     a2
     a5     a4     a3