Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2010

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: How to construct symmetric matrix from just a one half

  • To: mathgroup at smc.vnet.net
  • Subject: [mg110408] Re: How to construct symmetric matrix from just a one half
  • From: Srikanth K S <sriperso at gmail.com>
  • Date: Wed, 16 Jun 2010 05:42:41 -0400 (EDT)

*Here it is:

mat1 + Transpose[mat1] - DiagonalMatrix[Diagonal[mat1]]
*---


2010/6/15 Srikanth K S <sriperso at gmail.com>

> *Sorry, that seems like a mistake!
> *---
>
>
> 2010/6/15 Srikanth K S <sriperso at gmail.com>
>
> *Here is a way, but there could be other elegant ways than this!
>>
>> *In[8]:== mat1=={{1,0,0,0},{2,3,0,0},{4,9,5,0},{2,2,3,4}};
>> In[12]:== Union@@@MapThread[List,{mat1,MapThread[List,mat1]}]
>> Out[12]== {{0,1,2,4},{0,2,3,9},{0,3,4,5,9},{0,2,3,4}}*
>> *---
>>
>>
>> 2010/6/15 dragec <culinovic at gmail.com>
>>
>> 1  0  0  0
>>> 2  3  0  0
>>> 4  9  5  0
>>> 2  2  3  4
>>>
>>
>>


  • Prev by Date: Re: Simplification question
  • Next by Date: Re: Simplification question
  • Previous by thread: Re: How to construct symmetric matrix from just a one half
  • Next by thread: Re: How to construct symmetric matrix from just a one half