Mailman 3 December 2018 - yt-dev

Announcing widgyts, the yt widgets package
by Madicken Munk 19 Dec '18

19 Dec '18

Hi all, We’re proud to announce the first release of the yt-widgets package, widgyts, which is a growing collection of Jupyter widgets for use in yt. The package is on PyPI so you can install it with: pip install widgyts This package was designed so that you can interactively explore your data with the goal of making data exploration more accessible to yt users. You can pan, zoom, and update view parameters (like the colormap or the colormap bounds) quickly and learn where interesting features of your data are. We’ve uploaded a couple of demonstration notebooks to give you a feel of the widget, one with IsolatedGalaxy and the others with slices and projections (made using yt) of Britton’s Pop II Prime dataset (thanks for making this dataset available Britton!). You can experiment and play around with the notebooks on the yt hub <https://girder.hub.yt/#raft/5c1ab9f5323d12000134e095>. Alternatively, you can watch <https://www.youtube.com/watch?v=5dl_m_6T2bU> or look at the slides <https://munkm.github.io/2018-07-13-scipy/> from Madicken’s talk at SciPy 2018 about the initial stages of this project. At present, widgyts consists of a few components. The foundational widget is that of a variable-mesh image viewer, using Rust compiled to WebAssembly. The WebAssembly code is used to do the most performant-limiting calculations in the widget, resulting in much higher framerates than pure javascript rendering. Because WebAssembly was designed to interface with javascript, widget features can be built out using standard Python/javascript aspects of Jupyter widgets. You can read a little bit more about WebAssembly here <https://developer.mozilla.org/en-US/docs/WebAssembly> and here <https://medium.com/javascript-scene/what-is-webassembly-the-dawn-of-a-new-e…> if you’d like to learn more about it. Widgyts also currently has a widget that quickly converts data arrays to rgba colormapped arrays, and a tool to set up a standard set of widget controls. This should work in all major browsers in the Jupyter notebook; at present Jupyterlab does not have support for easy distribution of wasm binaries. When able, we will build out support for this widget with Jupyterlab. We’d like to thank the hard work done on other projects to make the development of widgyts possible. In particular, we’d like to thank the Jupyter team and the developers of ipywidgets. We’d also like to thank the rust core team and the wasm-pack developers for their awesome platforms. Thanks for reading! If you’d like to give us any feedback on the widget, please don’t hesitate to reach out via e-mail, slack, or in either the rust <https://github.com/data-exp-lab/rust-yt-tools> or the widgyts <https://github.com/data-exp-lab/widgyts> repository. Madicken Munk, Matthew Turk, and Nathanael Claussen

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Index member functions save_object, load_object, save_data and get_data
by Matthew Turk 19 Dec '18

19 Dec '18

Hi all, With the advent and maturation of the YTData frontend, is there any use case we would still recommend folks use the functions Index.save_object Index.load_object Index.save_data Index.get_data or are they candidates for deprecation and removal in yt-4.0? -Matt

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Sign of angular momentum vector
by Nathan Goldbaum 14 Dec '18

14 Dec '18

Hi all, Bili put in a PR to reverse the orientation of yt's default angular momentum vector to be closer to what most people expect given conventions about right handed coordinate systems. See https://github.com/yt-project/yt/pull/2043 I'm a little nervous about merging this since it might be disruptive. Does anyone see any issues with merging? People on master branch should know what they're in for? If no one responds here or comments in the PR I'll probably merge the PR next week. -Nathan

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yt logo swag
by Nathan Goldbaum 06 Dec '18

06 Dec '18

Hi all, NumFOCUS just set up a swag shop for us: https://shop.spreadshirt.com/numfocus/yt+official+logo?q=I1019494011 Your purchases support NumFOCUS, see https://shop.spreadshirt.com/numfocus/ for more details and for branded swag from other NumFOCUS projects. Thanks so much to Gina Helfrich at NumFOCUS for setting this up for us. -Nathan

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Open issues with Light-cone creation?
by chrbecker01＠gmail.com 04 Dec '18

04 Dec '18

Dear all, I am just starting to get my head around yt and especially it's part on the construction of light-cones. I have written my own code so far to construct light-cones which extend beyond the box of my cosmological simulations. However I would love to see a general software which can transform any cosmological simulation box into any light-cone. Therefore I was wondering whether anyone of you could tell me if there are any open issues which I could start working on immediately? (Depending on how one would use the light-cone in the end I can already see some points of improvement, e.g.: interpolation scheme for positions and velocities of sub-&halos between snapshots, ...). Cheers, Christovis P.S.: I also have a nice pipeline to do gravitational strong lensing I could add to yt (currently using ctypes). as far as I have seen there is not much on gravitational lensing at the moment. Into which directory should I add the code once I have cleaned it up?

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