# PDE Toolkit - what is d when m is non-zero?

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To solve the following equation

we need to input values of m,d,c,a and f.

I have been able to input m,c,a,f, however, for d, there is a special rule. The following is from Matlab's own support pages.

It says "Generally, d is either proportional to results results.M, or is a linear combination of results.M and results.K". M and K are matrices obtained after the assembleFEMatrices (i.e., after discretization).

Now, to say the least, this is confusing, as I do have the values of the d matrix (2x2 symmetric matrix in my case). Any insights would be appreciated.

### Answers (1)

Ravi Kumar
on 21 Jan 2022

##### 10 Comments

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