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When modal analysis is desired, it must be declared in the SELECT section with the selector

 

MODES = integer

 

where integer is the number of modes to be analyzed.

 

The equation should then be written in the form

 

F(V) +LAMBDA*G(V) = H(X,Y)

 

Where F(V) and G(V) are the appropriate terms containing the dependent variable, and H(X,Y) is a driving source term.  

 

The name LAMBDA is automatically declared by FlexPDE to mean the eigenvalue, and should not be declared in the DEFINITIONS section.