Mass and right hand side of ODE computed by the same nested function

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I want to solve a system of coupled ordinary differential equations of the form
M(y) y'(t) = f(y)
without inverting the matrix M. Since both, M and f, are computed from the same elements, it seems most efficient to do this in a common function,
function [M, f] = myfun(...)
How can I pass this on to ode45?
Thanks, Michael

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