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Blitz Support : |
From: David L Goldsmith (David.L.Goldsmith_at_[hidden])
Date: 2004-12-15 13:17:59
I don't know if it's possible, (i.e., how proprietary they are about
such things) but you might try to find out what algorithms IDL uses to
do this stuff - it worked well enough (though I can't vouch for how
well-optimized it was/is).
DG
blitz-support-request_at_[hidden] wrote:
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>
>Today's Topics:
>
> 1. Re: Blitz-support Digest, Vol 124, Issue 1 (David L Goldsmith)
> 2. using VS 2002 with Blitz (David Johnson)
> 3. Re: Re: Blitz-support Digest, Vol 124, Issue 1 (Xianlian Zhou)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Tue, 14 Dec 2004 09:45:46 -0800
>From: "David L Goldsmith" <David.L.Goldsmith_at_[hidden]>
>Subject: [Blitz-support] Re: Blitz-support Digest, Vol 124, Issue 1
>To: blitz-support_at_[hidden]
>Message-ID: <41BF26CA.90704_at_[hidden]>
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>Maybe because he wants to assemble the array of indices on the fly and
>not have to loop over its dimension(s) to access the elements to assign
>to the receiving array (something I had to do all the time when I was an
>IDL statistical programmer - fortunately, IDL furnished that
>functionality "off the shelf", e.g., one could simply do something like
>A = B((1,2),(2,3),(3,4)) to assign to A the elements B(1,2), B(2,3) &
>B(3,4) or B = A(where(A>0)) to assign to B the positive elements of A).
> However, Xianlian, this is something you MAY have to code yourself
>(I'm sure I'll be corrected if it already exists) - might I suggest
>deriving an array class, adding the required methods, and, when
>debugged, maybe sharing? :-)
>
>DG
>
>blitz-support-request_at_[hidden] wrote:
>
>
>
>>Send Blitz-support mailing list submissions to
>> blitz-support_at_[hidden]
>>
>>To subscribe or unsubscribe via the World Wide Web, visit
>> http://www.oonumerics.org/mailman/listinfo.cgi/blitz-support
>>or, via email, send a message with subject or body 'help' to
>> blitz-support-request_at_[hidden]
>>
>>You can reach the person managing the list at
>> blitz-support-owner_at_[hidden]
>>
>>When replying, please edit your Subject line so it is more specific
>>than "Re: Contents of Blitz-support digest..."
>>
>>
>>Today's Topics:
>>
>> 1. Nonuniform subarray. (Xianlian Zhou)
>> 2. Re: Nonuniform subarray. (Simon Perreault)
>> 3. Mirko Cambi/MI/IMISIGECOSIM is out of the office.
>> (mirko.cambi_at_[hidden])
>>
>>
>>----------------------------------------------------------------------
>>
>>Message: 1
>>Date: Sat, 11 Dec 2004 14:05:43 -0600
>>From: Xianlian Zhou <alex.xl.zhou_at_[hidden]>
>>Subject: [Blitz-support] Nonuniform subarray.
>>To: blitz-support_at_[hidden]
>>Message-ID: <2967e0ef041211120578645b57_at_[hidden]>
>>Content-Type: text/plain; charset=US-ASCII
>>
>>Hi,
>>
>>Does anyone know how to make a nonuniform subarray?
>>
>>For a simple example:
>> Array<int,1> A(3),B(5);
>> A=0;
>> B=1,2,3,4,5;
>> How could I define a nonuniform idex such as {1,2,4};
>>and make A=B({1,2,4}) ?
>>
>>
>>The Range object only represent a set of uniform indices, and the
>>array indeirction require the lhs and rhs arrays must be the same
>>shape;
>>
>>Alex Zhou
>>
>>
>>------------------------------
>>
>>Message: 2
>>Date: Sat, 11 Dec 2004 15:11:34 -0500
>>From: Simon Perreault <nomis80_at_[hidden]>
>>Subject: Re: [Blitz-support] Nonuniform subarray.
>>To: Xianlian Zhou <alex.xl.zhou_at_[hidden]>, Support list for Blitz++
>> <blitz-support_at_[hidden]>
>>Message-ID: <200412111511.34684.nomis80_at_[hidden]>
>>Content-Type: text/plain; charset="iso-8859-1"
>>
>>On Saturday December 11 2004 15:05, Xianlian Zhou wrote:
>>
>>
>>
>>
>>>For a simple example:
>>>Array<int,1> A(3),B(5);
>>>A=0;
>>>B=1,2,3,4,5;
>>> How could I define a nonuniform idex such as {1,2,4};
>>>and make A=B({1,2,4}) ?
>>>
>>>
>>>
>>>
>>Why do you want it complicated when you can do:
>>
>>B(0) = A(1);
>>B(1) = A(2);
>>B(2) = A(4);
>>
>>
>>
>>
>>
>
>
>
>------------------------------
>
>Message: 2
>Date: Tue, 14 Dec 2004 14:35:36 -0700
>From: "David Johnson" <dave_at_[hidden]>
>Subject: [Blitz-support] using VS 2002 with Blitz
>To: "blitz-support_at_[hidden]" <blitz-support_at_[hidden]>
>Message-ID: <6.1.2.0.2.20041214143317.03f19b88_at_[hidden]>
>Content-Type: text/plain; charset="us-ascii"
>
>I have been using VS2003 sucessfully with Blitz for quite a while now. But
>to support another project I need to use VS2002 since that is all that
>another code we tie into uses. I'm having trouble compiling my code under
>2002. Has anybody been able to use 2002 with Blitz 0.8 (or 0.7)? What did
>you need to do to get it all to work correctly.
>
>Thanks in Advance.
>
>Dave
>
>
>
>David Johnson
>Cullimore and Ring Tech., Inc.
>Voice: 303-471-9622
>Fax: 303-971-0035
>dave_at_[hidden]
>http://www.crtech.com
>
>Hot engineering .... Cool software (tm)
>.........................................................................
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>HTML attachment scrubbed and removed
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>------------------------------
>
>Message: 3
>Date: Tue, 14 Dec 2004 18:26:24 -0600
>From: Xianlian Zhou <alex.xl.zhou_at_[hidden]>
>Subject: Re: [Blitz-support] Re: Blitz-support Digest, Vol 124, Issue
> 1
>To: Support list for Blitz++ <blitz-support_at_[hidden]>
>Message-ID: <2967e0ef041214162667a66f53_at_[hidden]>
>Content-Type: text/plain; charset=US-ASCII
>
>Yes, the example I gave is only for illustration. I used to do this
>kind of thing in Mathematica or other similar softwares.
>
>In fact, I get quite big 1D and 2D arrays for a finite element
>program, in which I need assemble the small element matrix to a big
>global matrix or extract some submatrix(array) from the global
>matrix(array). In my problem, it will be quite often used, and
>typically the subindices are not uniform spaced.
>
>But if Blitz++ doesn't have such a functionality for nonuniform
>subarray, it seems I have to do some extra work.
>
>
>On Tue, 14 Dec 2004 09:45:46 -0800, David L Goldsmith
><David.L.Goldsmith_at_[hidden]> wrote:
>
>
>>Maybe because he wants to assemble the array of indices on the fly and
>>not have to loop over its dimension(s) to access the elements to assign
>>to the receiving array (something I had to do all the time when I was an
>>IDL statistical programmer - fortunately, IDL furnished that
>>functionality "off the shelf", e.g., one could simply do something like
>>A = B((1,2),(2,3),(3,4)) to assign to A the elements B(1,2), B(2,3) &
>>B(3,4) or B = A(where(A>0)) to assign to B the positive elements of A).
>> However, Xianlian, this is something you MAY have to code yourself
>>(I'm sure I'll be corrected if it already exists) - might I suggest
>>deriving an array class, adding the required methods, and, when
>>debugged, maybe sharing? :-)
>>
>>DG
>>
>>blitz-support-request_at_[hidden] wrote:
>>
>>
>>
>>>Send Blitz-support mailing list submissions to
>>> blitz-support_at_[hidden]
>>>
>>>To subscribe or unsubscribe via the World Wide Web, visit
>>> http://www.oonumerics.org/mailman/listinfo.cgi/blitz-support
>>>or, via email, send a message with subject or body 'help' to
>>> blitz-support-request_at_[hidden]
>>>
>>>You can reach the person managing the list at
>>> blitz-support-owner_at_[hidden]
>>>
>>>When replying, please edit your Subject line so it is more specific
>>>than "Re: Contents of Blitz-support digest..."
>>>
>>>
>>>Today's Topics:
>>>
>>> 1. Nonuniform subarray. (Xianlian Zhou)
>>> 2. Re: Nonuniform subarray. (Simon Perreault)
>>> 3. Mirko Cambi/MI/IMISIGECOSIM is out of the office.
>>> (mirko.cambi_at_[hidden])
>>>
>>>
>>>----------------------------------------------------------------------
>>>
>>>Message: 1
>>>Date: Sat, 11 Dec 2004 14:05:43 -0600
>>>From: Xianlian Zhou <alex.xl.zhou_at_[hidden]>
>>>Subject: [Blitz-support] Nonuniform subarray.
>>>To: blitz-support_at_[hidden]
>>>Message-ID: <2967e0ef041211120578645b57_at_[hidden]>
>>>Content-Type: text/plain; charset=US-ASCII
>>>
>>>Hi,
>>>
>>>Does anyone know how to make a nonuniform subarray?
>>>
>>>For a simple example:
>>> Array<int,1> A(3),B(5);
>>> A=0;
>>> B=1,2,3,4,5;
>>> How could I define a nonuniform idex such as {1,2,4};
>>>and make A=B({1,2,4}) ?
>>>
>>>
>>>The Range object only represent a set of uniform indices, and the
>>>array indeirction require the lhs and rhs arrays must be the same
>>>shape;
>>>
>>>Alex Zhou
>>>
>>>
>>>------------------------------
>>>
>>>Message: 2
>>>Date: Sat, 11 Dec 2004 15:11:34 -0500
>>>From: Simon Perreault <nomis80_at_[hidden]>
>>>Subject: Re: [Blitz-support] Nonuniform subarray.
>>>To: Xianlian Zhou <alex.xl.zhou_at_[hidden]>, Support list for Blitz++
>>> <blitz-support_at_[hidden]>
>>>Message-ID: <200412111511.34684.nomis80_at_[hidden]>
>>>Content-Type: text/plain; charset="iso-8859-1"
>>>
>>>On Saturday December 11 2004 15:05, Xianlian Zhou wrote:
>>>
>>>
>>>
>>>
>>>>For a simple example:
>>>>Array<int,1> A(3),B(5);
>>>>A=0;
>>>>B=1,2,3,4,5;
>>>> How could I define a nonuniform idex such as {1,2,4};
>>>>and make A=B({1,2,4}) ?
>>>>
>>>>
>>>>
>>>>
>>>Why do you want it complicated when you can do:
>>>
>>>B(0) = A(1);
>>>B(1) = A(2);
>>>B(2) = A(4);
>>>
>>>
>>>
>>>
>>>
>>_______________________________________________
>>Blitz-support mailing list
>>Blitz-support_at_[hidden]
>>http://www.oonumerics.org/mailman/listinfo.cgi/blitz-support
>>
>>
>>
>
>
>------------------------------
>
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>End of Blitz-support Digest, Vol 125, Issue 1
>*********************************************
>
>