Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.programmer > #22146

Re: compare several boolean matrix’s

From Arved Sandstrom <asandstrom2@eastlink.ca>
Newsgroups comp.lang.java.programmer
Subject Re: compare several boolean matrix’s
References <8f60207e-f848-490b-a402-7cc1aba657e9@googlegroups.com> <vj83h81u85vu2c49tbvc4pph0p8onqrr0h@4ax.com> <5111a718$0$283$14726298@news.sunsite.dk>
Message-ID <w3iQs.69474$j95.41225@newsfe31.iad> (permalink)
Organization Public Usenet Newsgroup Access
Date 2013-02-05 21:09 -0400

Show all headers | View raw

On 02/05/2013 08:43 PM, Arne Vajhøj wrote:
> On 2/5/2013 7:26 PM, Roedy Green wrote:
>> On Tue, 5 Feb 2013 11:19:58 -0800 (PST), keijaf2011@gmail.com wrote,
>> quoted or indirectly quoted someone who said :
>>> Is there any way to compare several boolean matrix=92s(25 matrix=92s)
>>> and p=
>>> ick up a final valid matrix of those 25.
>>
>> Java's matrix handling is quite pedestrian because of the way they are
>> stored. For heavy duty work use a C library with JNI glue.
>
> Java does not have builtin matrixes, so it is entirely up
> to the developer how they are stored.
>
> If the developer stored them as a 1D array, then Java will
> store them exactly like C.
>
> So JNI would not make any sense in that case.
>
> ArrayList<ArrayList<Boolean>> would have some overhead that
> may or may not be significant.
>
> Arne
>
Odd suggestion (on Roedy's part) to go to C and JNI for "heavy duty" 
work. Fact is, if your work with arrays/matrices is so "heavy duty" that 
Java even with decent 3rd party numerical libraries is getting painful, 
one had best consider a recent Fortran or Matlab or J or something 
similar...*not* use C (Numerical Recipes notwithstanding...)

AHS

Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

compare several boolean matrix’s keijaf2011@gmail.com - 2013-02-05 11:19 -0800
  Re: compare several boolean matrix’s Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-02-05 15:47 -0500
  Re: compare several boolean matrix’s Roedy Green <see_website@mindprod.com.invalid> - 2013-02-05 16:26 -0800
    Re: compare several boolean matrix’s Arne Vajhøj <arne@vajhoej.dk> - 2013-02-05 19:43 -0500
      Re: compare several boolean matrix’s Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-02-05 21:09 -0400
  Re: compare several boolean matrix’s Arne Vajhøj <arne@vajhoej.dk> - 2013-02-05 19:40 -0500
  Re: compare several boolean matrix’s Keivan Jafari <keijaf2011@gmail.com> - 2013-02-05 23:21 -0800
  Re: compare several boolean matrix’s Keivan Jafari <keijaf2011@gmail.com> - 2013-02-06 03:23 -0800
    Re: compare several boolean matrix’s Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-02-06 07:55 -0400
      Re: compare several boolean matrix’s Keivan Jafari <keijaf2011@gmail.com> - 2013-02-06 04:11 -0800
        Re: compare several boolean matrix’s Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-02-06 08:24 -0400
          Re: compare several boolean matrix’s Keivan Jafari <keijaf2011@gmail.com> - 2013-02-06 06:00 -0800
        Re: compare several boolean matrix’s lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-02-06 14:00 +0000
    Re: compare several boolean matrix’s Arne Vajhøj <arne@vajhoej.dk> - 2013-02-08 16:18 -0500
  Re: compare several boolean matrix’s Keivan Jafari <keijaf2011@gmail.com> - 2013-02-06 06:35 -0800
    Re: compare several boolean matrix’s Patricia Shanahan <pats@acm.org> - 2013-02-06 07:49 -0800
    Re: compare several boolean matrix’s lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-02-06 16:13 +0000
  Re: compare several boolean matrix’s Keivan Jafari <keijaf2011@gmail.com> - 2013-02-06 08:01 -0800
  Re: compare several boolean matrix’s Keivan Jafari <keijaf2011@gmail.com> - 2013-02-06 08:20 -0800
    Re: compare several boolean matrix’s lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-02-06 16:33 +0000
  Re: compare several boolean matrix’s Keivan Jafari <keijaf2011@gmail.com> - 2013-02-06 08:42 -0800
    Re: compare several boolean matrix’s Lars Enderin <lars.enderin@telia.com> - 2013-02-06 18:09 +0100
      Re: compare several boolean matrix’s Keivan Jafari <keijaf2011@gmail.com> - 2013-02-06 09:14 -0800
        Re: compare several boolean matrix’s Lars Enderin <lars.enderin@telia.com> - 2013-02-06 18:29 +0100
          Re: compare several boolean matrix’s Keivan Jafari <keijaf2011@gmail.com> - 2013-02-06 09:40 -0800
    Re: compare several boolean matrix’s lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-02-06 17:19 +0000
      Re: compare several boolean matrix’s Keivan Jafari <keijaf2011@gmail.com> - 2013-02-06 09:29 -0800
        Re: compare several boolean matrix’s lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-02-06 18:18 +0000
          Re: compare several boolean matrix’s Lars Enderin <lars.enderin@telia.com> - 2013-02-06 19:57 +0100
            Re: compare several boolean matrix’s lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-02-06 19:02 +0000
              Re: compare several boolean matrix’s T®oll <spooksRus@derbyshire-crania.org> - 2013-02-06 21:01 +0000
          Re: compare several boolean matrix’s Keivan Jafari <keijaf2011@gmail.com> - 2013-02-08 11:21 -0800
            Re: compare several boolean matrix’s Keivan Jafari <keijaf2011@gmail.com> - 2013-02-08 11:31 -0800
              Re: compare several boolean matrix’s lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-02-08 19:49 +0000
                Re: compare several boolean matrix’s Keivan Jafari <keijaf2011@gmail.com> - 2013-02-08 12:24 -0800
                Re: compare several boolean matrix’s Arne Vajhøj <arne@vajhoej.dk> - 2013-02-08 23:30 -0500
                Re: compare several boolean matrix’s Arne Vajhøj <arne@vajhoej.dk> - 2013-02-08 23:32 -0500
                Re: compare several boolean matrix’s lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-02-09 08:39 +0000
                Re: compare several boolean matrix’s Lew <lewbloch@gmail.com> - 2013-02-09 11:18 -0800
                Re: compare several boolean matrix’s Arne Vajhøj <arne@vajhoej.dk> - 2013-02-09 19:25 -0500
                Re: compare several boolean matrix’s Lew <lewbloch@gmail.com> - 2013-02-09 23:36 -0800
                Re: compare several boolean matrix’s Arne Vajhøj <arne@vajhoej.dk> - 2013-02-10 13:54 -0500
            Re: compare several boolean matrix’s Arne Vajhøj <arne@vajhoej.dk> - 2013-02-08 16:30 -0500
        Re: compare several boolean matrix’s Patricia Shanahan <pats@acm.org> - 2013-02-06 11:24 -0800

csiph-web