[Matplotlib-users] Interpolation method of python matplotlib contourf

[Athanasios Karagiannidis]

Hello again Ian

I can work with linear, no problem!

Regarding, the reference: The link may not be sufficient. I depend.  I guess I may have to find a general reference for the linear interpolation to incorporate in my manuscript.

Thank you very much!

Best regards

Sakis

Athanasios F. Karagiannidis
Physicist, PhD Meteorology and Climatology
E-mail: thankar at live.com

________________________________
From: Ian Thomas <ianthomas23 at gmail.com>
Sent: Tuesday, February 2, 2021 2:44 PM
To: Athanasios Karagiannidis <thankar at live.com>
Cc: matplotlib-users at python.org <matplotlib-users at python.org>
Subject: Re: [Matplotlib-users] Interpolation method of python matplotlib contourf

Hi Sakis,

No, you cannot control the interpolation method, you are stuck with linear for now.  It is on my wishlist for future improvements, but this is no help to you now.

To demonstrate that it is linear interpolation I would reference the code, e.g. https://github.com/matplotlib/matplotlib/blob/ea6803254567eaaa9adb027b541a6885d9fa246f/src/_contour.cpp#L1345-L1354 is the C++ interpolation function which is self-evidently linear interpolation.  I am not sure if that link is good enough for a manuscript though.

Ian

On Tue, 2 Feb 2021 at 12:22, Athanasios Karagiannidis <thankar at live.com<mailto:thankar at live.com>> wrote:
Hello Ian

Another interpolation may come handy in the future. Is it possible to control the interpolation method?

The fact that the current interpolation method is not documented is a pity. I need to reference it in a manuscript...

Sakis

Athanasios F. Karagiannidis
Physicist, PhD Meteorology and Climatology
E-mail: thankar at live.com<mailto:thankar at live.com>

________________________________
From: Ian Thomas <ianthomas23 at gmail.com<mailto:ianthomas23 at gmail.com>>
Sent: Tuesday, February 2, 2021 1:17 PM
To: Athanasios Karagiannidis <thankar at live.com<mailto:thankar at live.com>>
Cc: matplotlib-users at python.org<mailto:matplotlib-users at python.org> <matplotlib-users at python.org<mailto:matplotlib-users at python.org>>
Subject: Re: [Matplotlib-users] Interpolation method of python matplotlib contourf

Hello Sakis,

All of Matplotlib's contouring functions (contour, contourf, tricontour, tricontourf) use linear interpolation along grid edges.  This is not explicitly documented anywhere.

Are there other interpolation options that you would like?  I can think of logarithmic as one possibility.

Ian

On Tue, 2 Feb 2021 at 10:08, Athanasios Karagiannidis <thankar at live.com<mailto:thankar at live.com>> wrote:
Hello to all

I want to ask what is the default interpolation method of python matplotlib contourf? Where can I find relative documentation? Could someone help me?

Best regards

Sakis


Athanasios F. Karagiannidis
Physicist, PhD Meteorology and Climatology
E-mail: thankar at live.com<mailto:thankar at live.com>

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