Re: [yt-dev] Particle phase plotting

Sorry folks—this is a repeat of my earlier message which I accidentally sent from my other email. Feel free to ignore.

On May 6, 2016, at 11:38 AM, John ZuHone wrote:

Hi all,

I had a question about how we do particle phase plots / 2d profiles.

I’ve noticed that we way we do this involves some kind of deposition of the particle data into a grid. This necessitates never allowing one to make log-spaced bins for a particle 2d profile, though you can of course plot them in logspace.

This has rather nasty consequences, however, for data which has a huge dynamic range over orders of magnitude and for which log-spaced bins would make a lot of sense. See, for example, this plot:

http://i.imgur.com/RvCp3uD.png http://i.imgur.com/RvCp3uD.png

where a lot of the interesting data is at low density but has simply been swallowed up into the first bin in density space because of the linear spacing, making the plot essentially useless. Note this plot was made with a ridiculous amount of bins, 16000x16000, and it still washes things out at low density too much.

So I guess my questions are:

1. Why do we need to use deposition instead of simply binning up the particle data? Isn’t this what we do for grid-spaced data?

2. Is there any reason why we cannot use log-spaced bins with deposition (even if we have to hack it somehow)?

Best,

John

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