Re: Error installing the symbol package

[Doug Stewart]

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  :-)