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RE: Error installing the symbol package

From: Simon A. Turner
Subject: RE: Error installing the symbol package
Date: Sat, 6 May 2017 16:15:23 +0100

Hello Doug


I was trying to brute force reverse engineer transmission line parameters, I have a problem where I am given the A, B, C, D and need to calculate the R, L, C, G (see attached image). I think there is another way and I am reviewing my study material, “again”


Kind regards

Simon Turner



From: Doug Stewart [mailto:address@hidden
Sent: 06 May 2017 15:56
To: Simon A. Turner <address@hidden>
Cc: Help GNU Octave <address@hidden>
Subject: Re: Error installing the symbol package




On Sat, May 6, 2017 at 10:36 AM, Simon A. Turner <address@hidden> wrote:

Hello Doug


I am looking for numerical answers, I was led to believe that I needed this plugin to solve a simultaneous equation input with less effort than converting my equations to a matrix. Either way the problem of the plug in not installing remains for quite a few people as a quick google search reveals.


Kind regards





if you have 2 loops




           --------------      r1  -------------------------------------r3---------------- vout

          |                                                  |                                     |

       Vin                    i1                         r2                     i2           r4

          |                                                  |                                     |




i1*r1 + i1* r2  - i2*r2                                    =Vin

-i1*r2             + i2*r2 +i2*r3  + i2*r4            =0








r3=3 ohms


Vin =5 volts


then we have

  i1                       i2

r1+r2              -r2                                         = 5

-r2                  + r2 +r3 +r4                           =0


a=[ 3    -2;

     -2   9]








octave gives:



>> a=[ 3    -2;

     -2   9]

a =


   3  -2

  -2   9


>> b=[5


b =






>> cur=a\b

cur =






>> vout=cur(2)*4

vout =  1.7391 volts





I hope this helps  :-)

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Description: PNG image

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