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math1-Visitor
1-Visitor
July 11, 2014
Question

trying to understand PDE

  • July 11, 2014
  • 2 replies
  • 3595 views

Hi,

I am trying to learn PDE in mathcad,.. Its my first time with PDE, could anyone pls help me with this?

Thanks in advance

2 replies

W
Werner_E25-Diamond I
25-Diamond I
July 11, 2014

Its unclear to me what you are trying to do.

q is treated as the spatial variable name first, but when it comes to the BC you treat it like a functon!?

n(q,t) is neither defined nor searched for.

u is first defined as a function in 1 variable and then used as if its a function in two variables.

Concerning the syntax of the Pdesolve() call Alan pointed you in a previous thread to the appropriate help page. Please read and use the information given there and study the examples and the quicksheet.

M
math1-VisitorAuthor
1-Visitor
July 11, 2014

this became a bit confusive, when i used u many times.

well this is what i want to define actually du/dt (q,t) = -n (q,t)*v (q,t)

what do u mean by BC?

W
Werner_E25-Diamond I
25-Diamond I
July 11, 2014

preeti baskaran wrote:

this became a bit confusive, when i used u many times.

well this is what i want to define actually du/dt (q,t) = -n (q,t)*v (q,t)

And what do you know about n and v? You are just searching for u?

what do u mean by BC?

Boundary condition.

H
HarveyHensley12-Amethyst
12-Amethyst
July 12, 2014

It looks to me like you have an ode system, not a pde. Look at odesolve.

A
AlanStevens19-Tanzanite
19-Tanzanite
July 13, 2014

The attached file contains some comments and questions aimed at pointing you in the right direction (I hope!).

Alan

M
math1-VisitorAuthor
1-Visitor
July 14, 2014

thanks! I will look on it

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