[Mesa-users] A Query regarding storing an extra variable

[Earl Bellinger]

Dear Pulkit,

It sounds like you want to compute a variable in one subroutine, and access
it in another.

For this you can use `s% xtra(1) = mdot_edd_eta` and then read it later
from this xtra array in data_for_extra_binary_columns.

See e.g.
https://docs.mesastar.org/en/release-r22.11.1/using_mesa/extending_mesa.html?highlight=xtra#the-star-info-structure
> The s% xtra(1:30) array is a place to write temporary data of type
real(dp) which follow the logic of a time-step and so get carried over
across restarts, restored in retries, etc.

Does that solve it?

Best wishes,
Earl


*Earl Patrick Bellinger *
Postdoctoral Research Fellow
Max Planck Institute for Astrophysics
Stellar Astrophysics Centre
https://earlbellinger.com

On Mon, Apr 10, 2023 at 8:20 PM Pulkit Ojha via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Dear MESA-users,
>
> I'm working with MESA Binary to evolve a binary system consisting of a
> point mass accretor and an evolving donor star. I'm getting stuck in
> storing a variable which has been defined in one of the subroutines in
> run_binary_extras file. Can anyone suggest me how to store such a variable?
>
> For instance, I've defined "mdot_edd_eta" in the subroutine eval_mdot_edd.
> To store the variable as an output column, I tried to define it in the
> subroutine "data_for_extra_binary_columns" or
> "data_for_extra_binary_history_header_items(for getting it as a binary
> header)" as it's done for any other variable, but it shows the error
> "Error: Symbol 'mdot_edd_eta' at (1) has no IMPLICIT type" .
>
> I shall be grateful for your kind help.
>
> Truly
> Pulkit
>
>
> Pulkit Ojha
> 5th Year Integrated MSc.,
> School of Physical Sciences,
> National Institute of Science Education and Research
> <https://www.niser.ac.in/>
> Bhubaneswar, INDIA
>
>
>
> _______________________________________________
> mesa-users at lists.mesastar.org
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>
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