How can I do to put on simulink a differential equation system like the one below?

dm/dt =-z*( da/dz ) - Pt

Pt is a constant

Answer 1

[Babak]

what is da/dz?

you mean derivative of a function a with respect to a space variable z?

If this is the case then it is a PDE and you have 2 functions of a(z) and m(t).

Did I understand you correctly?