[Gsll-devel] How to pass a null pointer to apply-step

[Leo]

Hello,

I am solving two coupled ODEs, one with respect to time, another to z.
An element in the solution of the first ODE is used in the second one.
So I have to use the lower-level apply-step function:

(apply-step stepper time y step-size yerr dydt-in dydt-out)

The gsl manual says dydt-in can be a null pointer. I wonder how to use
null pointer in apply-step? Thank you.

Leo

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