Asked by mohan
on 11 Dec 2012

I have a PDE equation with variable coefficients

Ut-Uxx= P(t)

Boundary condition

U(0,t) = 0

Ux(x,t) = -sig(t)/eta

initial condition

U(x2,0) = P_*x*(H-x)

Ut is partial diff w.r.t t Uxx is partial diff w.r.t x

P(t) is function of t ,eta is constant ,H is constant

sig(t) is a function of t

How to solve the PDE equation and after solvint the equation i need to give step input to P(t) and sig(t)

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## 2 Comments

## Babak (view profile)

Direct link to this comment:http://www.mathworks.com/matlabcentral/answers/56291#comment_116640

Please clarify these:

Please correct the typos or they will confuse the whole crowd who are here only to help you answering your question!

## mohan (view profile)

Direct link to this comment:http://www.mathworks.com/matlabcentral/answers/56291#comment_116654

**yes it is Ux(L,t)

sig(t) is a function of time ...

P_ is constant and not same as P . U(x2,0) = U(x,0)

P(t) and sig(t) are step inputs

i have to solve for 2 cases i.e how the pde is varying for the two case's below

first case .. P(t)= 7*stepfunction and sig(t)= 0

second case...P(t)=0 and sig(t)= step function