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Re: It would be nice to have DiagonalMatrix accept a matrix as building

  • To: mathgroup at smc.vnet.net
  • Subject: [mg113541] Re: It would be nice to have DiagonalMatrix accept a matrix as building
  • From: Patrick Scheibe <pscheibe at trm.uni-leipzig.de>
  • Date: Tue, 2 Nov 2010 05:00:05 -0500 (EST)

Yes, obiously but I wanted it as similar as possible to the
function documentation of "the other system" 

blkdiag(a,b,c,d,...)

so that you see that you see that it's only a few letters more
even *without* built-in function..

Cheers
Patrick



On Nov 1, 2010, at 11:02 AM, Nasser M. Abbasi wrote:

> On 10/31/2010 6:47 AM, Patrick Scheibe wrote:
>> Hi,
>> 
>> aehmm, what about
>> 
>> SparseArray[Band[{1, 1}] ->  {b,b,b,b,b,b}]
>> 
>> where b={{1, 2}, {3, 4}}?
>> Takes me about 5 seconds to type. So why care that DiagonalMatrix
>> can't do it?
>> 
>> Cheers
>> Patrick
>> 
> 
> Well, if you wanted to repeat the block 200 times, you probably do not 
> want to sit and type 'b' 200 times :)
> 
> But using ConstantArray, like Zach just mentioned is what I did not know 
> about.  His solution:
> 
> SparseArray[Band[{1, 1}] -> ConstantArray[block, {nBlocks}]]
> 
> is good enough so not to require special option for DiagonalMatrix. So 
> this issue is closed for me. I'll use ConstantArray for this.
> 
> Thanks for everyone input on this.
> 
> --Nasser
> 



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