Can you give your code ? Le 1 janv. 2016 22:44, "Ken" <[email protected]> a écrit :
> Hi thanks for your reply, but I am not sure what exactly do you mean by > expand "then to factorize". > > I found that if I set the transfer function to be H = k / ( (s+p1) * > (s+p2) ), then the inverse laplace transform becomes: > > k*e^(-p1*t) / (p1-p2) + k*e^(-p2*t) / (p1-p2) > > *which is what I prefer.* It is weird to me that adding a constant 'k' > change the form that Sympy chooses to show the result. > > On Friday, January 1, 2016 at 2:46:19 AM UTC-5, Christophe Bal wrote: >> >> Hello. >> >> Have you triez to expand 1nd then to factorize the formula ? >> Le 1 janv. 2016 03:42, "Ken" <[email protected]> a écrit : >> >>> I've just started learning Sympy. I wrote a few lines of code to perform >>> a inverse laplace transform on a simple 2nd order transfunction: >>> >>> H(s) = 1 / ((s+p1) * (s+p2)). >>> >>> The result I got from Sympy is >>> >>> (e^(p1*t) - e^(p2*t))*e^-t*(p1+p2) / (p1 - p2) >>> >>> Is there a way to simplify this result to the one like in Maxima >>> (e^-t*p1 + e^-t*p2) / (p1-p2) ? >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "sympy" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To post to this group, send email to [email protected]. >>> Visit this group at https://groups.google.com/group/sympy. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/sympy/0b4a638b-b9d8-426d-99c3-12fdaf1cc973%40googlegroups.com >>> <https://groups.google.com/d/msgid/sympy/0b4a638b-b9d8-426d-99c3-12fdaf1cc973%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> For more options, visit https://groups.google.com/d/optout. >>> >> -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/f730ca86-6a64-4224-b039-2b7197fb68c7%40googlegroups.com > <https://groups.google.com/d/msgid/sympy/f730ca86-6a64-4224-b039-2b7197fb68c7%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAAb4jGmFdQKP02PbDahX_7SCgxBVUkhGEG2Xcx0V-Gr7Q0fqdA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
