Re: [yt-users] yt-users Digest, Vol 85, Issue 77
Hi Suoqing,
Thanks, that worked.
Sandy
On Tue, Mar 24, 2015 at 4:10 PM,
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Today's Topics:
1. Re: Line-of-sight velocity dispersion? (Suoqing JI) 2. Periodic enzo volume? (Kalina Borkiewicz) 3. Re: Particle Size in Projection Plots (Yuan Li)
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Message: 1 Date: Tue, 24 Mar 2015 12:30:32 -0700 From: Suoqing JI
To: Discussion of the yt analysis package Subject: Re: [yt-users] Line-of-sight velocity dispersion? Message-ID: <67698C33-B4FE-4E93-B9FD-01ABB2D755CC@physics.ucsb.edu> Content-Type: text/plain; charset="utf-8" Hi Sandy,
The easiest way occurring to me is, since the standard deviation can be expressed as:
sqrt( E(X^2) - E(X)^2 )
so you could defined the ?z-velocity squared? as a new field, and calculate its average for each column (that is E(X^2) ). Then you have both E(X)^2 and E(X^2), thus the standard deviation can be computed.
Best wishes, -- Suoqing JI Ph.D Student Department of Physics University of California, Santa Barbara http://web.physics.ucsb.edu/~suoqing
On Mar 24, 2015, at 12:04 PM, Sandy Yuan
wrote: Hi all, I have created a box object containing the data field "z-velocity". Right now, I can project "z-velocity" along the z axis to get the average "z-velocity" for each column, but is there a way to calculate the standard deviation of "z-velocity" along each column as well? What is the best way to do this in yt 2.6? Any suggestion would be greatly appreciated. Best, -- Sandy _______________________________________________ yt-users mailing list yt-users@lists.spacepope.org http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org
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Message: 2 Date: Tue, 24 Mar 2015 14:56:02 -0500 From: Kalina Borkiewicz
To: Subject: [yt-users] Periodic enzo volume? Message-ID: <5511C152.3070205@illinois.edu> Content-Type: text/plain; charset="utf-8"; Format="flowed" Hi! Yt newbie here, sorry if my question is stupid or simple or both. I'm trying to render a periodic enzo volume. I figured I could just set ds.periodicity = (True, True True) , but that didn't seem to do anything. Searching the docs for "periodicity" doesn't have any results relating to EnzoDataset, so I'm wondering, can I make this periodic? How?
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Message: 3 Date: Tue, 24 Mar 2015 16:10:05 -0400 From: Yuan Li
To: Discussion of the yt analysis package Subject: Re: [yt-users] Particle Size in Projection Plots Message-ID: Content-Type: text/plain; charset="utf-8" Hi Cameron,
I tired that, and this is the error message I get:
*** YTDataSelectorNotImplemented: Data selector 'arbitrary_grid' not implemented.
I looks like I will have to do it with matplotlib as Britton suggested after all :).
By the way, in the examples given on Filtering Particle Fields here http://yt-project.org/doc/analyzing/filtering.html, sometimes "Stars" is used and sometimes it is the lowercase "stars". Is that a typo?
Yuan
On Tue, Mar 24, 2015 at 12:26 PM, Cameron Hummels
wrote: I think you may be able to do the ProjectionPlot() by specifying the keyword "data_source=obj":
http://yt-project.org/docs/dev/reference/api/generated/yt.visualization.plot...
On Tue, Mar 24, 2015 at 9:03 AM, Yuan Li
wrote: Hi all,
I was thinking about doing what Britton suggested or making a 2d histogram in matplotlib, but Cameron's suggestion sounds like what I was looking for. How do I project this obj after it is created? When I
do yt.ProjectionPlot(obj.....) I got the error message saying this object has no attribute 'coordinates'.
Yuan
On Tue, Mar 24, 2015 at 11:03 AM, Britton Smith
wrote:
In this situation, you might just want to plot the particles themselves using a scatter plot in matplotlib. The matplotlib.scatter function allows you to specify both the color and/or size of the points with arrays, so those properties can vary for the individual particles.
Britton
On Tue, Mar 24, 2015 at 2:58 PM, Cameron Hummels
wrote: Hi Yuan,
I think the issue here is that you're taking a particle quantity--stellar ages--and trying to deposit that quantity on to the grid, which is primarily defined in enzo by the distribution of gas. Thus, young stars tend to occur in locations of star formation, which is to say, where there is cold dense gas, the grid is more refined there (assuming you're using density-based AMR). This means that you'll tend to get smaller "pixels" for young stars than for old stars where the stars may have drifted into regions of coarser spatial resolution and get larger "pixels".
One solution for this would be to define your own underlying grid on to which you should deposit your particle quantities. That way you can make a fixed resolution grid (so all the pixels are the same size) and deposit your particle quantities like Stellar Age, and it should solve your problem. To find out more about doing this, check out this section of the docs:
http://yt-project.org/docs/dev/analyzing/objects.html#arbitrary-grids-object...
Good luck, and let us know how it goes!
Cameron
On Sun, Mar 22, 2015 at 9:40 PM, Yuan Li
wrote: Hi all,
I have a basic question related to the sizes of particles in a projection plot (in yt2). I am trying to make a plot that shows the
average
line of sight star particle ages.
Right now I am plotting the stellar-density-weighted star ages, and a lot of the young stars look very small (see figure attached). I would like to show that the stars far away from the center are younger. Is
tried to there a way
to make the small dots bigger? Other suggestions are also welcome!
Thank you! Yuan [image: Inline image 1]
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-- Cameron Hummels Postdoctoral Researcher Steward Observatory University of Arizona http://chummels.org
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-- Cameron Hummels Postdoctoral Researcher Steward Observatory University of Arizona http://chummels.org
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