DE Laplace solvers

[ptc-1368288]

In separate sheets for easier qs style and especially for "clear var" that 14 users have reported being a problem. Try these three sheets and report to Mona if working or not. That will help the PTC team about the InvLaplace reported incorrect as per the books .

Interesting to see if it works in 14.

jmG

[alnstevens]

Mathcad 14 needs a little help to do the inverse laplace part here.

stv

[ptc-1368288]

On 1/15/2010 9:31:39 AM, stv wrote:
>Mathcad 14 needs a little help
>to do the inverse laplace part
>here.
>
>stv
___________________________________

Thanks for making it work for 14 users. The 14 Laplace algebra and the construct around a dummy [L, solve(L)] is hard to visualize. I can see it comes from an unterminated piece of work from books. The question is about all the traditional feedback and control Laplace applications, i.e: how it handles the Laplace algebra ? It you are interested and willing, I will pass something on that.

Jean

[alnstevens]

On 1/15/2010 11:28:08 AM, jmG wrote:

>>The 14 Laplace algebra and the construct
>around a dummy [L, solve(L)] is hard to
>visualize.

>Jean

nL-Y0m+msL = �(s) is just the Laplace transform of your equation nf(t)+mdf(t)/dt = q(t), where I've simply used L to represent the Laplace transform of f(t). The solve statement then solves for L.

I guess I could have written the solution directly, as you did in your original.

Not sure if this addresses your point or not!

stv

[ptc-1368288]

On 1/16/2010 12:48:24 PM, stv wrote:
>On 1/15/2010 11:28:08 AM, jmG wrote:
>
>>>The 14 Laplace algebra and the construct
>>around a dummy [L, solve(L)] is hard to
>>visualize.
>
>>Jean
>
>nL-Y0m+msL = �(s) is just the Laplace
>transform of your equation
>nf(t)+mdf(t)/dt = q(t), where I've
>simply used L to represent the Laplace
>transform of f(t). The solve statement
>then solves for L.
>
>I guess I could have written the
>solution directly, as you did in your
>original.
>
>Not sure if this addresses your point or
>not!
>
>stv
________________________

I understand, but my logical understanding is getting more square with the years. Still, Mathcad 14 rejects my beautiful 11.2a solver, as you said. BTW, what about the 2nd order homogeneous ?

Jean