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Can't run my main Matlab file related to ODE solution

  1. Mar 10, 2013 #1
    Hey, guys

    Can you please help me to spot mistakes in numerical solution of following diffusivty equation:

    ∂P/∂t= 0.001127*k/(μ*ϕ*c_t )*((∂P/∂x)^2*c+(∂^2 P)/(∂x^2 )).

    Matlab give the following command:

    Undefined function or variable 'r'.

    Error in function_handle2 (line 9)
    for i=1:r

    Error in odearguments (line 88)
    f0 = feval(ode,t0,y0,args{:}); % ODE15I sets args{1} to yp0.

    Error in ode15s (line 149)
    [neq, tspan, ntspan, next, t0, tfinal, tdir, y0, f0, odeArgs, odeFcn, ...

    Error in Diffusivity_equation (line 41)
    [t,p]=ode15s(@function_handle2,tout,p0,options);


    I don't know how to interpret the last command. M files containing relevant commands are attached.
     

    Attached Files:

  2. jcsd
  3. Mar 14, 2013 #2

    DrClaude

    User Avatar

    Staff: Mentor

    I get an error on line 10 of function_handle2. When I comment it out, I get an error because dss004 is undefined.
     
  4. Mar 14, 2013 #3
    Hey, mate

    You can download dss004 m file from the following link:
    https://www.physicsforums.com/showthread.php?p=4292439#post4292439.

    I couldn't upload the dss004 file, so decided to redirect you to my previous post where I have already atttached dss004.
     
  5. Mar 14, 2013 #4
    Guys, I need to solve by Matlab the following PDE:
    4e5c3bb7979f.png

    I am desperate about finding solution; I have tried many approaches, and the files attached on topic start is my last approach.
     
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