How to combine fractions using octave symbolic?












0















Does anyone know how to get Octave to combine fractions in the symbolic package? For example, I would like to make "1+1/s" rewritten as "(s^2 + 1)/s".



My reason is that I want to get zeros and poles of frequency domain expressions into the right place in the rational expression. The above is a very simple example of a more complicated use case, typically with lots of R, L, C constants.






matlab octave symbolic-math







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  • I guess that you mean (s+1)/s and not (s^2+1)/s. You can use the function factor.

    – obchardon
    Nov 28 '18 at 9:06
















0















Does anyone know how to get Octave to combine fractions in the symbolic package? For example, I would like to make "1+1/s" rewritten as "(s^2 + 1)/s".



My reason is that I want to get zeros and poles of frequency domain expressions into the right place in the rational expression. The above is a very simple example of a more complicated use case, typically with lots of R, L, C constants.






matlab octave symbolic-math







share|improve this question

























  • I guess that you mean (s+1)/s and not (s^2+1)/s. You can use the function factor.

    – obchardon
    Nov 28 '18 at 9:06














0












0








0








Does anyone know how to get Octave to combine fractions in the symbolic package? For example, I would like to make "1+1/s" rewritten as "(s^2 + 1)/s".



My reason is that I want to get zeros and poles of frequency domain expressions into the right place in the rational expression. The above is a very simple example of a more complicated use case, typically with lots of R, L, C constants.






matlab octave symbolic-math







share|improve this question
















Does anyone know how to get Octave to combine fractions in the symbolic package? For example, I would like to make "1+1/s" rewritten as "(s^2 + 1)/s".



My reason is that I want to get zeros and poles of frequency domain expressions into the right place in the rational expression. The above is a very simple example of a more complicated use case, typically with lots of R, L, C constants.






matlab octave symbolic-math




matlab octave symbolic-math






share|improve this question















share|improve this question













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edited Nov 28 '18 at 6:20









TeeKea

3,22851932




3,22851932










asked Nov 28 '18 at 6:09









forkandwaitforkandwait

1,98461820




1,98461820













  • I guess that you mean (s+1)/s and not (s^2+1)/s. You can use the function factor.

    – obchardon
    Nov 28 '18 at 9:06



















  • I guess that you mean (s+1)/s and not (s^2+1)/s. You can use the function factor.

    – obchardon
    Nov 28 '18 at 9:06

















I guess that you mean (s+1)/s and not (s^2+1)/s. You can use the function factor.

– obchardon
Nov 28 '18 at 9:06





I guess that you mean (s+1)/s and not (s^2+1)/s. You can use the function factor.

– obchardon
Nov 28 '18 at 9:06












1 Answer
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oldest

votes


















1














You can use the function factor(), in this case it will simply put the whole expression with the same common denominator:



syms x,s



x = 1+1/s

res = factor(x)


and 



res =   

s + 1

─────

  s





share|improve this answer























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    1 Answer
    1






    active

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    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    1














    You can use the function factor(), in this case it will simply put the whole expression with the same common denominator:



    syms x,s
    

    
x = 1+1/s
    
res = factor(x)


    and 



    res =   
    
s + 1
    
─────
    
  s





    share|improve this answer




























      1














      You can use the function factor(), in this case it will simply put the whole expression with the same common denominator:



      syms x,s
      

      
x = 1+1/s
      
res = factor(x)


      and 



      res =   
      
s + 1
      
─────
      
  s





      share|improve this answer


























        1












        1








        1







        You can use the function factor(), in this case it will simply put the whole expression with the same common denominator:



        syms x,s
        

        
x = 1+1/s
        
res = factor(x)


        and 



        res =   
        
s + 1
        
─────
        
  s





        share|improve this answer













        You can use the function factor(), in this case it will simply put the whole expression with the same common denominator:



        syms x,s
        

        
x = 1+1/s
        
res = factor(x)


        and 



        res =   
        
s + 1
        
─────
        
  s






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 28 '18 at 9:11









        obchardonobchardon

        4,0441821




        4,0441821
































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