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Re: Creating Matrix from vectors specific issue.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg100755] Re: [mg100745] Creating Matrix from vectors specific issue.
  • From: Sseziwa Mukasa <mukasa at jeol.com>
  • Date: Sat, 13 Jun 2009 06:01:58 -0400 (EDT)
  • References: <200906120946.FAA27906@smc.vnet.net>

On Jun 12, 2009, at 5:46 AM, Kinu wrote:

> Thanks to all who replied before
> My exact problem is as follows..
> I am getting vectors from my program which is of the form
> v1 = {{1},{2},{3}};
> v2 = {{4},{5},{6}};
> BUT NOT v1 = {1,2,3} and v2 = {4,5,6}
>
> Now if i use A = {v1,v2} and then Transpose[A] i am getting the
> required matrix only in the 2nd case i.e when v1 =  {1,2,3} and
> similarly v2.
> However when i use the same A = {v1,v2} in the 1st case and then
> Transpose[] i.e when v1 =
> {{1},{2},{3}} and similarly v2, i am not getting the required matrix.
> If anyone would help me with this specific point it will be helpful.
>
> I have also seen that the dimension in case 1 is {3,1} while that in
> case 2 is {3}. If there is any way to interchange the two .. that also
> will suffice. i.e if i can change {{1},{2},{3}} to {1,2,3} that will
> also suffice.

A = Transpose[{Flatten[v1],Flatten[v2]}]

Mathematica makes a distinction between a matrix (tensor of rank 2)  
which has two dimensions, and a vector (tensor of rank 1), the  
function ArrayDepth can be used to determine the rank of a  
structure.  Flatten can be used to modify rank.

Regards,

Ssezi


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