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mdimapilis1-Visitor
1-Visitor
November 8, 2015
Question

"This variable is undefined" error in Mathcad

  • November 8, 2015
  • 1 reply
  • 2484 views

Hi!

I am trying to solve for a simple wave equation using the Pdesolve function. However, it returns an error saying "This variable is undefined". I made sure to follow the proper format. Can you please help me locate where I went wrong?

Thank you!

1 reply

A
AlanStevens19-Tanzanite
19-Tanzanite
November 9, 2015

From the help file: 

PDE Equations:

    • Equations must be defined using Boolean equals‌. Second partial derivatives are not allowed on the left-hand-side of equations, you must convert your equation to a system of equations in first derivatives only (see the QuickSheet example).

You should also look at your boundary condition definitions carefully!

Alan

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