ChangeLog¶

This is a non-comprehensive log of changes to the code.

Contributors¶

Here are all of the contributors to the code base, in alphabetical order.

Tom Abel

David Collins

Andrew Cunningham

Nathan Goldbaum

Cameron Hummels

Ji-hoon Kim

Steffen Klemer

Kacper Kowalik

Michael Kuhlen

Eve Lee

Chris Malone

Chris Moody

Andrew Myers

Jeﬀ Oishi

Jean-Claude Passy

Thomass Robitaille

Anna Rosen

Anthony Scopatz

Devin Silvia

Sam Skillman

Stephen Skory

Britton Smith

Geoﬀrey So

Casey Stark

Elizabeth Tasker

Matthew Turk

Rick Wagner

John Wise

John ZuHone

Version 2.4¶

The 2.4 release was particularly large, encompassing nearly a thousand changesets and a number of new features.

To help you get up to speed, we’ve made an IPython notebook file demonstrating a few of the changes to the scripting API. You can download it here.

Most Visible Improvements¶

Threaded volume renderer, completely refactored from the ground up for speed and parallelism.

The Plot Window (see Simple Data Inspection) is now fully functional! No more PlotCollections, and full, easy access to Matplotlib axes objects.

Many improvements to Time Series analysis:

EnzoSimulation now integrates with TimeSeries analysis!

Auto-parallelization of analysis and parallel iteration

Memory usage when iterating over parameter files reduced substantially

Many improvements to Reason, the yt GUI

Addition of “yt reason” as a startup command

Keyboard shortcuts in projection & slice mode: z, Z, x, X for zooms, hjkl, HJKL for motion

Drag to move in projection & slice mode

Contours and vector fields in projection & slice mode

Color map selection in projection & slice mode

3D Scene

Integration with the all new yt Hub ( http://hub.yt-project.org/ ): upload variable resolution projections, slices, project information, vertices and plot collections right from the yt command line!

Other Changes¶

ProjectionPlot and SlicePlot supplant the functionality of PlotCollection.

Camera path creation from keyframes and splines

Ellipsoidal data containers and ellipsoidal parameter calculation for halos

PyX and ZeroMQ now available in the install script

Consolidation of unit handling

HDF5 updated to 1.8.7, Mercurial updated to 2.2, IPython updated to 0.12

Preview of integration with Rockstar halo finder

Improvements to merger tree speed and memory usage

Sunrise exporter now compatible with Sunrise 4.0

Particle trajectory calculator now available!

Speed and parallel scalability improvements in projections, profiles and HOP

New Vorticity-related fields

Vast improvements to the ART frontend

Many improvements to the FLASH frontend, including full parameter reads, speedups, and support for more corner cases of FLASH 2, 2.5 and 3 data.

Integration of the Grid Data Format frontend, and a converter for Athena data to this format.

Improvements to command line parsing

Parallel import improvements on parallel filesystems (from yt.pmods import *)

proj_style keyword for projections, for Maximum Intensity Projections (proj_style = "mip")

Fisheye rendering for planetarium rendering

Profiles now provide *_std fields for standard deviation of values

Generalized Orientation class, providing 6DOF motion control

parallel_objects iteration now more robust, provides optional barrier. (Also now being used as underlying iteration mechanism in many internal routines.)

Dynamic load balancing in parallel_objects iteration.

Parallel-aware objects can now be pickled.

Many new colormaps included

Numerous improvements to the PyX-based eps_writer module

FixedResolutionBuffer to FITS export.

Generic image to FITS export.

Multi-level parallelism for extremely large cameras in volume rendering

Light cone and light ray updates to fit with current best practices for parallelism

Version 2.3¶

(yt 2.3 docs)

Multi-level parallelism
Real, extensive answer tests
Boolean data regions (see Combining Objects: Boolean Data Objects)
Isocontours / flux calculations (see Extracting Isocontour Information)
Field reorganization (see What Types of Fields are There?)
PHOP memory improvements
Bug fixes for tests
Parallel data loading for RAMSES, along with other speedups and improvements there
WebGL interface for isocontours and a pannable map widget added to Reason (see What is Within Reason?)
Performance improvements for volume rendering
Adaptive HEALpix support (see Adaptive HEALpix Volume Rendering)
Column density calculations (see Radial Column Density)
Massive speedup for 1D profiles
Lots more, bug fixes etc.
Substantial improvements to the documentation, including Using the Manual Plotting Interface and a revamped Quickstart Guide.

Version 2.2¶

(yt 2.2 docs)

Command-line submission to the yt Hub (http://hub.yt-project.org/)
Initial release of the web-based GUI Reason, designed for efficient remote usage over SSH tunnels (see The GUI Reason)
Absorption line spectrum generator for cosmological simulations (see Making an Absorption Spectrum)
Interoperability with ParaView for volume rendering, slicing, and so forth
Support for the Nyx code
An order of magnitude speed improvement in the RAMSES support
Quad-tree projections, speeding up the process of projecting by up to an order of magnitude and providing better load balancing
“mapserver” for in-browser, Google Maps-style slice and projection visualization (see Mapserver)
Many bug fixes and performance improvements
Halo loader (see Loading Haloes Off Disk)

Version 2.1¶

(yt 2.1 docs)

HEALpix-based volume rendering for 4pi, allsky volume rendering
libconfig is now included
SQLite3 and Forthon now included by default in the install script
Development guide has been lengthened substantially and a development bootstrap script (Bootstrapping Your Development Environment) is now included.
Installation script now installs Python 2.7 and HDF5 1.8.6
iyt now tab-completes field names
Halos can now be stored on-disk much more easily between HaloFinding runs.
Halos found inline in Enzo can be loaded and merger trees calculated
Support for CASTRO particles has been added
Chombo support updated and fixed
New code contributions
Contour finder has been sped up by a factor of a few
Constrained two-point functions are now possible, for LOS power spectra
Time series analysis (Time Series Analysis) now much easier
Stream Lines now a supported 1D data type (AMRStreamlineBase)
Stream Lines now able to be calculated and plotted (Streamlining)
In situ Enzo visualization now much faster
“gui” source directory reorganized and cleaned up
Cython now a compile-time dependency, reducing the size of source tree updates substantially
yt-supplemental repository now checked out by default, containing cookbook, documentation, handy mercurial extensions, and advanced plotting examples and helper scripts.
Pasteboards now supported and available
Parallel yt efficiency improved by removal of barriers and improvement of collective operations

Version 2.0¶

Major reorganization of the codebase for speed, ease of modification, and maintainability

Re-organization of documentation and addition of Orientation Session

Support for FLASH code

Preliminary support for MAESTRO, CASTRO, ART, and RAMSES (contributions welcome!)

Perspective projection for volume rendering

Exporting to Sunrise

Preliminary particle rendering in volume rendering visualization

Drastically improved parallel volume rendering, via kD-tree decomposition

Simple merger tree calculation for FOF catalogs

New and greatly expanded documentation, with a “source” button

Version 1.7¶

Direct writing of PNGs (see Streamlining)

Multi-band image writing (see Streamlining)

Parallel halo merger tree (see Halo Merger Tree)

Parallel structure function generator (see Two Point Functions)

Image pan and zoom object and display widget (see The AMR Image Panner)

Parallel volume rendering (see Volume Rendering)

Multivariate volume rendering, allowing for multiple forms of emission and absorption, including approximate scattering and Planck emissions. (see Volume Rendering)

Added Camera interface to volume rendering (See Volume Rendering)

Off-axis projection (See Volume Rendering)

Stereo (toe-in) volume rendering (See Volume Rendering)

DualEPS extension for better EPS construction

yt now uses Distribute instead of SetupTools

Better iyt initialization for GUI support

Rewritten, memory conservative and speed-improved contour finding algorithm

Speed improvements to volume rendering

Preliminary support for the Tiger code

Default colormap is now algae

Lightweight projection loading with projload

Improvements to yt.data_objects.time_series

Improvements to yt.extensions.EnzoSimulation (See Analyzing an Entire Simulation)

Removed direct_ray_cast

Fixed bug causing double data-read in projections

Added Cylinder support to ParticleIO

Fixes for 1- and 2-D Enzo datasets

Preliminary, largely non-functional Gadget support

Speed improvements to basic HOP

Added physical constants module

Beginning to standardize and enforce docstring requirements, changing to autosummary-based API documentation.

Version 1.6.1¶

Critical fixes to ParticleIO

Halo mass function fixes for comoving coordinates

Fixes to halo finding

Fixes to the installation script

“yt instinfo” command to report current installation information as well as auto-update some types of installations

Optimizations to the volume renderer (2x-26x reported speedups)

Version 1.6¶

Version 1.6 is a point release, primarily notable for the new parallel halo finder (see Halo Finding)

(New) Parallel HOP ( http://arxiv.org/abs/1001.3411 , Halo Finding )

(Beta) Software ray casting and volume rendering (see Volume Rendering)

Rewritten, faster and better contouring engine for clump identification

Spectral Energy Distribution calculation for stellar populations (see Synthetic Spectrum Generator)

Optimized data structures such as the hierarchy

Star particle analysis routines (see Star Particle Analysis)

Halo mass function routines (see Halo Mass Function: Start to Finish)

Completely rewritten, massively faster and more memory efficient Particle IO

Fixes for plots, including normalized phase plots

Better collective communication in parallel routines

Consolidation of optimized C routines into amr_utils

Many bug fixes and minor optimizations

Version 1.5¶

Version 1.5 features many new improvements, most prominently that of the addition of parallel computing abilities (see Parallel Computation With YT) and generalization for multiple AMR data formats, specifically both Enzo and Orion.

Rewritten documentation

Fully parallel slices, projections, cutting planes, profiles, quantities

Parallel HOP

Friends-of-friends halo finder

Object storage and serialization

Major performance improvements to the clump finder (factor of five)

Generalized domain sizes

Generalized field info containers

Dark Matter-only simulations

1D and 2D simulations

Better IO for HDF5 sets

Support for the Orion AMR code

Spherical re-gridding

Halo profiler

Disk image stacker

Light cone generator

Callback interface improved

Several new callbacks

New data objects – ortho and non-ortho rays, limited ray-tracing

Fixed resolution buffers

Spectral integrator for CLOUDY data

Substantially better interactive interface

Performance improvements everywhere

Command-line interface to many common tasks

Isolated plot handling, independent of PlotCollections

Version 1.0¶

Initial release!

yt 2.4 documentation