Re: Mathematica 6.0 and MatrixManipulations

• To: mathgroup at smc.vnet.net
• Subject: [mg76313] Re: Mathematica 6.0 and MatrixManipulations
• From: Mark Fisher <mark at markfisher.net>
• Date: Sat, 19 May 2007 04:46:41 -0400 (EDT)
• References: <f2h9ve\$1g0\$1@smc.vnet.net> <f2jvp3\$do4\$1@smc.vnet.net>

```I see. And one can overload DiagonalMatrix to produce block-diagonal
matrices:

unprotected = Unprotect[DiagonalMatrix];
DiagonalMatrix[listOfBlocks : {__?MatrixQ}] :=
Block[{x}, With[{a = Array[x, Length[listOfBlocks]]},
]]
Protect[unprotected//Evaluate];

m1 = {{1,2},{3,4}};
m2 = {{5,6,7},{8,9,10},{11,12,13}};

DiagonalMatrix[{m1,m2}]

--Mark

Michael wrote:
> Hmm ...
>
> Yesterday, after perusing version 6.0, it appears that "ArrayFlatten"
> and "ConstantArray" are two new commands to be aware of.  In the
> online documentation, ArrayFlatten also will work with implicitly-
> defined dimensions for zero matrices, such as the following case:
>
> In1:= m = {{a,b},{c,d}};
> In2:= newMat=ArrayFlatten[{{0,m,0},{0,0,m}}];
>
> Neat!
>
> Regards,
>
> Michael
>
> On May 17, 3:15 am, Michael <mcau... at gmail.com> wrote:
>> Hi,
>>
>> In Mathematica 6.0, I notice that the instruction
>>
>> In[1]:=  Needs["LinearAlgebra`MatrixManipulation`"];
>>
>> produces the following warning:
>>
>> "General::obspkg: LinearAlgebra`MatrixManipulation` is now obsolete.
>> The legacy version being loaded may conflict with current Mathematica
>> functionality. See the Compatibility Guide for updating information."
>>
>> In fact, a lot of my 'favourite' methods, "BlockMatrix", "ZeroMatrix",
>> etc. no longer are even documented in the help browser, nor is the
>> package MatrixManipulation.
>>
>> My previous version was Mathematica 5.2, and so what *should* I be
>> using now instead of "BlockMatrix", "ZeroMatrix", etc.?  Thus far, I
>> haven't been able to find any information about obsolesced functions
>> within the help browser (F1).
>>
>> Any suggestions or help would be greatly appreciated!
>>
>> Thanks,
>>
>> Michael
>
>
>

```

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