From: Niko Schwarz <niko.schwarz@...>
Date: 2001-10-21T02:07:34+09:00
Subject: [ruby-talk:22838] array prob

I still have probs with ruby, i hope you can find me, it wont take long, 
promise!

,----[ ng.rb ]
| require "matrix.rb"
| 
| def solveGauss(a)
|     tri = Array.new
|     0.upto(a.length-1) { |s|
|         a = a.sort { |a, b|  

thats the first problem. what you see is a workaround, but i dont get why 
a.sort! { bla...
doesnt work.

|             b[s].abs <=> a[s].abs
|         }
|         fail("Pivotelement ist 0") if a[0][s] == 0

and here goes the second problem. for some weird reason which ive been 
trying to find the whole afternoon, a[0] is a fixnum in run 2.

|         tri.push a.shift
|         a.map! { |elt|
|             faktor = (-a[0][s]) / tri[tri.length-1][s]
|             0.upto(elt.length-1) { |i|
|                 elt[i] += ( tri[tri.length-1][i] * faktor)
|             }
|         }
|     }
|     print Matrix.rows(tri), "\n", Matrix.rows(a), "\n"
| end
| 
| print "give matrix\n"
| 
| read = Array.new
| while str = STDIN.gets 
|     read.push( str.split(",").map! {|elt| elt.to_f})
| end
| 
| print "sol vector plz\n"
| b = STDIN.gets.split(",").map! {|elt| elt.to_f} 
| 
| for e in read
|     e.push b.shift
| end
| 
| solveGauss(read)
| 
`----

i tried it always with the matrix
1,2
3,4

and the solution vector
5,6.

its supposed to be the gaussian algorithm, well, at least the first 2 steps.

please help me, ive been trying to solve this since ~6h.

regards,

nick

-- 
Technological progress has merely provided us with more efficient means
for going backwards.
                -- Aldous Huxley