From help-request at octave dot org Mon Jun  6 12:06:13 2005
Subject: Re: set of linear equations ax = b
From: Paul Roberts <raulpoberts at gmail dot com>
To: csanyipal at sks dot co dot yu
Cc: help at octave dot org
Date: Mon, 6 Jun 2005 10:04:56 -0700

Hi Paul,

The problem is the your B is a row vector when it needs to be a column
vector. Try:

B = [6;-7;6];

regards,
Paul

 
On 6/6/05, Csanyi Pal <csanyipal at sks dot co dot yu> wrote:
> Hello!
> 
> I have the following set of linear equations:
> 2x - y + 3z = 6
> -4x + 2y -z = -7
> 2x + y + 5z = 6
> 
> I made the matrixes:
> A = [2, -1, 3; -4, 2, -1; 2, 1, 5]
> B = [6,-7,6]
> 
> and then, to solve the set of linear equations, do:
> A \ B
> 
> but get the error:
> error: operator \: nonconformant arguments (op1 is 3x3, op2 is 1x3)
> error: evaluating binary operator `\' near line 16, column 3
> 
> or
> inv (A) * B
> 
> and get the error:
> error: operator *: nonconformant arguments (op1 is 3x3, op2 is 1x3)
> error: evaluating binary operator `*' near line 16, column 9
> 
> So what's wrong? Thanks!
> 
> --
> Regards,
> Paul
> ->->-> Debian Junior Project :-) :-) :-) :-) :-) :-) :-) :-) :-)
> 
> 
> 
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