laplace inverse of this function???

hi,

is there any site from which inverse of the s domain functions could be found online? i made a google search, but dint arrive at any... could anyone get me the inverse of this function if possible.. i got the inverse in matlab, but the program which i have written based on an IEEE paper, the results dont match.. this is a numerical method of laplace transforms.. from which i checked the graphs of both of them attained from my program and matlab. but dint get them right.,. so i want to find which of them is right and mroeover i have some other s functions whose inverses are to be known... the first thing i would like to have is the inverse for the function

sqrt(1+s) * exp(sqrt(1+s))

could anyone help me in getting a link or finding the inverse of this function ot both???

/cedance

hi

I suggest you to use symbolic laplace transform of
Matlab.

I have used laplace transform of matlab 6.5.1 and it works fine.


tnx

Laplace transform can be easily done in Matlab but his question is about the interplay between C and Matlab......In matlab you can import the properties of lapalce domain by SYMS command.Can that be infused in C like to have a header file for this.This is his question i think.

Did you excercise the residue integral method . if not please try it . I think it can be solve in that way.

How did you find this result?

sqr(1+s)*exp(sqr(1+s)) is very interesting.

bunalmis said:

How did you find this result?

sqr(1+s)*exp(sqr(1+s)) is very interesting.

Click to expand...

i have changed the reply! i found it in a neuroscience book. this was the equation in S domain of a two variable partial differential equation.

/cedance

The answer is:
1/4/t^(5/2)/pi^(1/2)*exp(-t-1/4/t)-1/2/t^(3/2)/pi^(1/2)*exp(-t-1/4/t)
using Matlab
I've verified it myself

tantoun2004 said:

The answer is:
1/4/t^(5/2)/pi^(1/2)*exp(-t-1/4/t)-1/2/t^(3/2)/pi^(1/2)*exp(-t-1/4/t)
using Matlab
I've verified it myself

Click to expand...

i get the expression of the quoted expression in matlab. i also checked that.

but, for the expression sqrt(1+s) i dont get the answer in t domain using matlab, but i get the result in mathematica. but for the expression given above i get in matlab but not in mathematica. and the irony is,

for the expression exp(sqrt(1+s)) neither of htem give the result, Am actually in need of the inverse laplace transform for all the 3 aformentioned functions .if any1 could help..

/cedance

Why the inverce Laplace transform of (using MatLab - syms)

sqrt(1+s)*(1/exp(sqrt(1+s)))
and
sqrt(1+s)*(exp(sqrt(1+s)))
are
identical?

The results are
1/4*(-2/pi^(1/2)+1/pi^(1/2)/t)*exp(-t-1/4/t)/t^(3/2)
and
1/4*(-2/pi^(1/2)+1/pi^(1/2)/t)*exp(-t-1/4/t)/t^(3/2) .

try all this in maple. it works good

bhgaurav said:

try all this in maple. it works good

Click to expand...

nope! mathematica is far more better than maple for symbolic math... not fruitful in that too!

/cedance