how can I use partfrac command?

Hi

i want to find the partial fraction expansion for the function

f(x) = (8x^2+37x+32)/((x+1)(x+2)(x+4))

I want to find it using partfrac command

when I try partfrac((8*(x^2) + 37*x + 32) / ((x + 1) * (x+2) * (x+4)))

I get an error: Undefined function or variable 'x'.

How can I do it?

Answer 1

[Walter Roberson]

syms x
partfrac((8*(x^2) + 37*x + 32) / ((x + 1) * (x+2) * (x+4)))

[Mohammad]

I tried that already but I got an error: Undefined function 'partfrac' for input arguments of type 'sym' :(

[Walter Roberson]

feval(symengine, 'partfrac', (8*(x^2) + 37*x + 32) / ((x + 1) * (x+2) * (x+4)))

[Mohammad]

perfect! Thanks a lot :)

[Hariharan 2015]

Not able to find Partfracs for this function. transfer =

               2 s + 20
  ----------------------------------
  s^5 + 3 s^4 + 6 s^3 + 12 s^2 + 8 s

Please help.

[Carlos Guerrero García]

Hariharan....I suggest the following code:

syms s;
laplace(ilaplace((2*s+20)/(s^5+3*s^4+6*s^3+12*s^2+8*s)))

ans = 

Answer 2

[Carlos Guerrero García]

I suggest the following code:

syms s;
laplace(ilaplace((8*s^2+37*s+32)/((s+1)*(s+2)*(s+4))))

ans =