What does it mean for arguments a, b, c in the function update_field_vals?

[WangYun1995]

I am confused about several arguments, e.g. field, a, b, and c in the function update_field_vals.
What are the differences between field and values?
Can you clarify the meaning for arguments a, b, and c?
And I don't understand indices in the line159, why should b['ind'] be multiplied by nx?
why should c['ind'] be multiplied nxny?
what does nxny refer to?

[shixun22]

Hi, Trying the example given in the code and looking into how the functions are called will help you find out the answers. abc are just dummies for xyz. The code is mapping 3D indices to a 1D one and thus the multiplication by nx and nx*ny respectively. By the way, as you can see in the comments of code, this clever way of doing cic is not my contribution. The credit goes to Joop and Neil. I only did a very small modification to Neil’s version. Best, Xun

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On Wed, Sep 9, 2020 at 9:12 AM WangYun1995 ***@***.***> wrote: I am confused about several arguments, e.g. field, a, b, and c in the function update_field_vals. What are the differences between field and values? Can you clarify the meaning for arguments a, b, and c? And I don't understand indices in the line159, why should b['ind'] be multiplied by nx? why should c['ind'] be multiplied nxny? what does nxny refer to? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#1>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABVSOCJDQKEWGD5RQLKG2LLSE3I7VANCNFSM4RAXNKLQ> .

[WangYun1995]

Hi, Trying the example given in the code and looking into how the functions are called will help you find out the answers. abc are just dummies for xyz. The code is mapping 3D indices to a 1D one and thus the multiplication by nx and nxny respectively. By the way, as you can see in the comments of code, this clever way of doing cic is not my contribution. The credit goes to Joop and Neil. I only did a very small modification to Neil’s version. Best, Xun
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On Wed, Sep 9, 2020 at 9:12 AM WangYun1995 @.**> wrote: I am confused about several arguments, e.g. field, a, b, and c in the function update_field_vals. What are the differences between field and values? Can you clarify the meaning for arguments a, b, and c? And I don't understand indices in the line159, why should b['ind'] be multiplied by nx? why should c['ind'] be multiplied nxny? what does nxny refer to? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#1>, or unsubscribe https://github.com/notifications/unsubscribe-auth/ABVSOCJDQKEWGD5RQLKG2LLSE3I7VANCNFSM4RAXNKLQ .

Thank you for your clarification!

[WangYun1995]

Why is there no return in the function update_field_vals?

[shixun22]

There is no need to because Python functions can make permanent modifications to elements of an input array (be careful about this!).

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On Wed, 9 Sep 2020 at 17:19, WangYun1995 ***@***.***> wrote: Why is there no return in the function update_field_vals? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#1 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABVSOCM37I35O3GRCGICXILSE5CC5ANCNFSM4RAXNKLQ> .