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09-08-2011
09:21 AM

09-08-2011
09:21 AM

Solving ODE's in Mathcad 14

Hello everyone

I apologize if this has been posted earlier (or if this is the wrong section), but I need help with Mathcad.

Having started college as an EE major last year, and restarting next year as a math major next year, math is obviously important for me to use. Mathcad is my preferred math software due to the simplicity of the program, and because it's not a programming language. I'm a horrible programmer, and I would go to great lengths to avoid programming. Originally, I thought that Mathcad couldn't solve differential equations, but after looking through the help files, I found *Odesolve* and other functions. The thing is, I can't see what the function is. The only "solution" I get is a graph, which won't be accepted as a proper answer to any problem here.

So how do I get Mathcad to return a function when solving ODE's ?

PS: I'm using Mathcad 14, but will upgrade if it's the only way to make this work.

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23 REPLIES 23

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09-08-2011
09:29 AM

09-08-2011
09:29 AM

Re: Solving ODE's in Mathcad 14

Firstly welcome to the forum.

Would you be able to upload the worksheet you are working on?

Mike

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09-08-2011
09:40 AM

09-08-2011
09:40 AM

Re: Solving ODE's in Mathcad 14

Thanks

Here's an example of what I'm doing.

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09-08-2011
04:14 PM

09-08-2011
04:14 PM

Re: Solving ODE's in Mathcad 14

I don't think you can solve ODE's symbolically, only numerically.

Mike

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09-08-2011
04:17 PM

09-08-2011
04:17 PM

Re: Solving ODE's in Mathcad 14

Good tutorial for you here.

http://learningexchange.ptc.com/tutorial/96/solving-an-ordinary-differential-equation-using-mathcad

Mike

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09-08-2011
10:41 PM

09-08-2011
10:41 PM

Re: Solving ODE's in Mathcad 14

You** have** solved for a function, you just don't realize it. (Need more practice with Mathcad!)

If you want the function that is the solution, that's another matter.

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09-09-2011
03:34 AM

09-09-2011
03:34 AM

Re: Solving ODE's in Mathcad 14

Hello!

I think following link will also be useful ("**Inside Mathcad Series: Programming, Solving, and ODE Solvers**"):

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09-09-2011
05:02 AM

09-09-2011
05:02 AM

Re: Solving ODE's in Mathcad 14

For this sort of ODE you can use Mathcad's symbolic Laplace transform functions to help get an analytical solution - see attached.

Alan

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09-09-2011
10:24 AM

09-09-2011
10:24 AM

Re: Solving ODE's in Mathcad 14

Alan;

Can you please post "Example 1b" as an RTF or pdf file? My 14.0 is choking on Step 1.

Thanks!!

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09-09-2011
11:02 AM

09-09-2011
11:02 AM

Re: Solving ODE's in Mathcad 14

Hi Fred,

I haven't really used the UnitsOf() so I messed around a little with your example.

"Help" suggests you change to SIUnitsOf(), but does not seem to matter.

You can refer to the units of a variable to make the function independent of the units used, it's also more concise.

Also, you don't need to use in a graph.

Thanks for the example

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