RE: Error installing the symbol package

[Simon A. Turner]

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

Simon

 

 

 

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

 

vout=i2*r4

 

 

let 

r1=1

r2=2

r3=3 ohms

r4=4

Vin =5 volts

 

then we have

  i1                       i2

r1+r2              -r2                                         = 5

-r2                  + r2 +r3 +r4                           =0

 

a=[ 3    -2;

     -2   9]

b=[5

     0]

 

cur=a\b

 

vout=cur(2)*4

 

octave gives:

 

 

>> a=[ 3    -2;

     -2   9]

a =

 

   3  -2

  -2   9

 

>> b=[5

     0]

b =

 

   5

   0

 

>> 

>> cur=a\b

cur =

 

   1.95652

   0.43478

 

>> 

>> vout=cur(2)*4

vout =  1.7391 volts

 

 

 

 

I hope this helps  :-)

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Description: PNG image