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MathGroup Archive 2007

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Re: copying values of entries between matrices

  • To: mathgroup at smc.vnet.net
  • Subject: [mg77983] Re: copying values of entries between matrices
  • From: dh <dh at metrohm.ch>
  • Date: Thu, 21 Jun 2007 05:32:07 -0400 (EDT)
  • References: <f5atd0$an9$1@smc.vnet.net>


Hi,

your first assigne reads: dOneCol[[0]] = .... This overwrites the head 

of dOneCol. Therefore, you should write: dOneCol[[++q0]] and delet the 

subsequent ++q.

hope this helps, Daniel





text.tex wrote:

> Hi,

> here is my problem:

> I have a 18x18 matrix called entMatr.

> I want to copy the values of the elements of the lower left half of

> entMatr into a 171x1 matrix called dOneCol.

> I had tried a 3-nested loop for copying the values from entMatr to

> dOneCol; the current version where I tried to replace the loop over

> the rows of dOneCol with a counter q produces a result, however the

> result is not what I want...

> 

> I'd greatly appreciate any pointers how to get this working!

> Thanks,

> Claus

> 

> This is what I tried:

> 

> <pre>

>  (* initialize entMatr *)

> entMatr = Table[Subscript[m, i, j], {i, 18}, {j, 18}];

> 

>  (* fill the lower left half of entMatr with some values *)

> For[i = 1, i < 18 + 1, i++,

>  For[j = i, j < 18 + 1, j++,

>   entMatr[[j, i]] = i

>   ]

>  ]

> 

>  (* initialize dOneCol *)

> dOneCol = Table[Subscript[n, x], {x, 171}];

> 

>  (* attempt to copy the values from entMatr to dOneCol *)

> q = 0;

> For[k = 1, k < 18 + 1, k++,

>  For[p = k, p < 18 + 1, p++,

>   dOneCol[[q]] = entMatr[[p,k]]

>     q++

>   ]

>  ]

> dOneCol

> </pre>

> 

> 




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