## Solving differential equations

## Solving differential equations

(OP)

Hello,

I've got differential equations to solve. I've managed to solve it graphically and I can compute values for different arguments of functions.

Now I would like Mathcad to print formulas for resulting functions, or their approximations if getting exact formulas is not possible. Is there any way to do it?

Attached is a screenshot of my calculations. I will also provide a Mathcad 14 file if needed.

Thank you.

Best regards,

Jarek

I've got differential equations to solve. I've managed to solve it graphically and I can compute values for different arguments of functions.

Now I would like Mathcad to print formulas for resulting functions, or their approximations if getting exact formulas is not possible. Is there any way to do it?

Attached is a screenshot of my calculations. I will also provide a Mathcad 14 file if needed.

Thank you.

Best regards,

Jarek

## RE: Solving differential equations

## RE: Solving differential equations

The solution in Mathcad is most likely wrong as I should have not used odesolve which apparently works only for single equations.

Thanks for your time.

## RE: Solving differential equations

Out of interest, what functions in the Common Maths package did you use. AFAICT from a quick glance, the CM package is purely numeric and doesn't offer symbolic solutions.

== The solution in Mathcad is most likely wrong as I should have not used odesolve which apparently works only for single equations.

odesolve works on multiple equations and I've seen some pretty complex worksheets that use odesolve. If the solution is wrong, it's more likely there is an error in its formulation.

## RE: Solving differential equations

I know the solution in Mathcad is wrong because it doesn't match numbers given in a book I got the equations from. On the other hand results produced by my Java application do match. So it is probably as you say, something must be wrong with the usage of odesolve.

On a side note, in the aforementioned book a symbolic solution was also given but some of intermediate formulas produce complex numbers while the final solution is supposed to be real. I have contacted the author and he had no idea how he had got the real solution a dozen years or so ago

## RE: Solving differential equations

http:/

It is hard for Mathcad and wxMaxima to find the inverse Laplace transform when using symbolics. I bet a CAS like Mathematica could do it.

Peter Nachtwey

Delta Computer Systems

http://www.deltamotion.com

## RE: Solving differential equations

This is very interesting. Thank you very much!