Mailman 3 May 2012 - yt-users

A basic question how yt treat the intersect cell.
by Jun-Hwan Choi May 7, 2012

May 7, 2012

Hi all, I have one conceptual question. When you make a profile, what happen one grid cell (finest cell) is bigger than one bin? Does yt interpolate the physical value (mass, density, velocity ...) and assign the appropriate value to the bins which the cell intersects? The very similar question is what happen one grid cell (finest) intersects with object boundary. For example, I define sphere and try to measure total mass of sphere. Does yt interpolate the mass of cell that intersects with … [View More]

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Off-axis projections using Homogenized Volumes and a weight field
by Cameron Hummels May 7, 2012

May 7, 2012

Hello everyone, I'm currently trying to generate an off-axis projection using a homogenized volume as an input, instead of the default kd-tree method. I have no problems using this method, until I try to add a weight field to the projection, then it simply returns "Inf" values for each pixel. I checked, and the exact same source using the kd-tree method works with no problems (it's just slower because I'm running this on a small subset of the overall dataset). Do I need to do … [View More]

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Interpreting parallel HOP catalog results
by Matthew Turk May 3, 2012

May 3, 2012

Hi all, Has anybody seen something like this before? This is output from a parallelHF catalog: http://paste.yt-project.org/show/2340/ What I think is odd is that the first set of spatial coordinates are the same for all the halos. Is that desired behavior? Thanks, Matt

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python timing
by Eric Hallman May 3, 2012

May 3, 2012

Is there a standard or best methodology for tracking python code performance? I see in the intertubes that one can use the time module, or timeit or other things. How about memory usage? Or is this typically handled by debugging tools? What I really want to do is isolate logjams in python code by function call etc. in a fairly non-intrusive way. Thanks for any advice. Eric -- Eric Hallman Tech-X Corporation hallman(a)txcorp.com 5621 Arapahoe Ave, Suite A Phone: (720)… [View More]

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Projection Performance
by Richard P Wagner May 2, 2012

May 2, 2012

Hi, I wanted to build a sequence of projections using various color maps along each axis. The data set I'm using the z = 0 one from the L7 simulation some of you are familiar with. Here's the paste of my current script: http://paste.yt-project.org/show/2335/ (The early sys.exit is deliberate.) Does anyone have an estimate of the time doing this projection serially should take? After two hours it was still going without having produced the first image. The same plots done on the z = 2.75 … [View More]

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orientation of renderings and write_bitmap
by Sam Skillman May 1, 2012

May 1, 2012

Hi all, There have been a few changes recently dealing with the orientation of the image that come out of the volume rendering. In https://bitbucket.org/yt_analysis/yt/pull-request/144/multi-index-widths-in…, the east and north vector were (rightly) swapped such that when specifying widths of the image it is done in (x,y,depth) instead of (y,x,depth). This has the side effect of transposing the images that are returned. However, this had been counteracted by the way write_bitmap takes the … [View More]

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error with derived field: operands could not be broadcast together with shapes
by Jean-Claude Passy May 1, 2012

May 1, 2012

Hi all, I am trying to compare the energy between two datasets. I execute the following script that uses the derived field 'RelativeEnergy': -------------------------------------------------------------------------------------------------------------------------------------------------- def _RelativeEnergy(field, data): return (data["TotalEnergy"]-data.pf.parameters["TotalEnergy_ref"])/data.pf.parameters["TotalEnergy_ref"] add_field("RelativeEnergy", function=_RelativeEnergy) … [View More]

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yt Google+ Hangout Tomorrow
by Sam Skillman May 1, 2012

May 1, 2012

Hi all, Tomorrow we are going to try out a Google Hangout hosted by +yt. This is a chance for you to ask questions or iterate on a particular piece of analysis you'd like to perform. Also feel free to give feedback or just stop by and say hi to us. We'll be starting around 2pm EST tomorrow and there should be several of the yt developers hanging out. Depending on how it goes, we'll consider running one ever so often as a form of office hours or discussion of new capabilities. Anyways, if … [View More]

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