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

Groups > comp.lang.c > #27824

Re: A C program

Show all headers | View raw

On 10/30/2012 12:38 PM, tom st denis wrote:
> On Oct 30, 12:13�pm, "BartC" <b...@freeuk.com> wrote:
>> "tom st denis" <t...@iahu.ca> wrote in messagenews:8b079e76-7530-46bd-ad32-e03deb4310fe@h15g2000yqe.googlegroups.com...
>>
>>> This is the equivalent of a math major asking us to help
>>> them solve the matrix
>>
>>> [ 2 1 ]
>>> [ 1 1 ]
>>
>> What's the answer?
> 
> R1-R2 and then R2-R1.

You haven't defined what R1 and R2 refer to, nor what those expressions
mean.

> So suppose you had the linear system
> 
> [2 1][3]
> [1 1][2]
> 
> Then you'd have
> 
> [1 0][1]
> [1 1][2]
> 
> And
> 
> [1 0][1]
> [0 1][1]
> 
> So x = 1 and y = 1 in this linear system.

Nor have you defined what x and y refer to.

Your original statement of the problem lacked sufficient detail to make
"solve" an applicable verb. There was sufficient information to use
"invert", instead. If you had added some variables, and asked to solve
for the values of those variables, for example:

"Solve
| 2 1 | |x| = |a|
| 1 1 | |y|   |b|

For x and y in terms of a and b"

that would also have been a meaningful question, with the answer x=a-b,
y=2b-a.
-- 
James Kuyper

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

Thread

A C program Nikhil Joshi <nitin.nitinperderusted.rastogi@gmail.com> - 2012-10-23 08:54 -0700
  Re: A C program James Kuyper <jameskuyper@verizon.net> - 2012-10-23 12:05 -0400
    Re: A C program Rich Webb <bbew.ar@mapson.nozirev.ten> - 2012-10-23 13:07 -0400
    Re: A C program BruceS <bruces42@hotmail.com> - 2012-10-29 21:58 +0000
  Re: A C program Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2012-10-23 10:46 -0600
  Re: A C program Keith Thompson <kst-u@mib.org> - 2012-10-23 13:28 -0700
  Re: A C program tom st denis <tom@iahu.ca> - 2012-10-30 06:28 -0700
    Re: A C program Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-10-30 15:42 +0000
      Re: A C program tom st denis <tom@iahu.ca> - 2012-10-30 08:44 -0700
        Re: A C program Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-10-30 17:28 +0000
          Re: A C program tom st denis <tom@iahu.ca> - 2012-10-30 10:32 -0700
            Re: A C program Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-10-30 18:21 +0000
              Re: A C program "Bill Cunningham" <nospam@nspam.invalid> - 2012-11-04 16:57 -0500
    Re: A C program "BartC" <bc@freeuk.com> - 2012-10-30 16:12 +0000
      Re: A C program tom st denis <tom@iahu.ca> - 2012-10-30 09:38 -0700
        Re: A C program James Kuyper <jameskuyper@verizon.net> - 2012-10-30 12:57 -0400
          Re: A C program tom st denis <tom@iahu.ca> - 2012-10-30 10:26 -0700
            Re: A C program James Kuyper <jameskuyper@verizon.net> - 2012-10-30 14:30 -0400
              Re: A C program tom st denis <tom@iahu.ca> - 2012-10-30 14:47 -0700
                Re: A C program James Kuyper <jameskuyper@verizon.net> - 2012-10-30 18:29 -0400
              Re: A C program "Bill Cunningham" <nospam@nspam.invalid> - 2012-11-04 16:35 -0500
                Re: A C program Keith Thompson <kst-u@mib.org> - 2012-11-04 14:25 -0800
                Re: A C program "BartC" <bc@freeuk.com> - 2012-11-04 23:53 +0000
                Re: A C program Keith Thompson <kst-u@mib.org> - 2012-11-04 16:09 -0800
            Re: A C program Rui Maciel <rui.maciel@gmail.com> - 2012-11-01 18:17 +0000
      Re: A C program Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-10-30 13:02 -0400
    Re: A C program Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2012-10-30 11:15 -0600
      Re: A C program tom st denis <tom@iahu.ca> - 2012-10-30 10:28 -0700
        Re: A C program Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-10-30 17:42 +0000
          Re: A C program tom st denis <tom@iahu.ca> - 2012-10-30 10:49 -0700
            Re: A C program Greg Martin <greg@softsprocket.com> - 2012-10-30 11:11 -0700
            Re: A C program Rui Maciel <rui.maciel@gmail.com> - 2012-11-01 18:11 +0000
        Re: A C program "Bill Cunningham" <nospam@nspam.invalid> - 2012-11-04 16:38 -0500
      Re: A C program Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-11-05 07:45 -0800
        Re: A C program James Kuyper <jameskuyper@verizon.net> - 2012-11-05 13:28 -0500
    Re: A C program Rui Maciel <rui.maciel@gmail.com> - 2012-11-01 18:03 +0000
    Re: A C program Rui Maciel <rui.maciel@gmail.com> - 2012-11-01 18:13 +0000

csiph-web