solvepdeeig ignores f coefficient

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The pde coefficients are given as: specifyCoefficients(model,'m',0,'d',1,'c',1,'a',0,'f',0);
However, no matter what I substitute into for 'f' I get the same result.
What's going on?

Accepted Answer

Harikrishnan Balachandran Nair
The 'solvepdeeig' function solves PDE eigen value problems of the form as stated in the documentation here :
We can see from the form of the equation that 'f' is not a part of the problem. Hence it may be specified as zero.

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