New: Define subsets with polygons The Plane Plot has a new button that lets you mark out a region of X-Y space by clicking on points. It's like the old blob drawing, but it gives you a subset defined by algebraic expression, using functions from the new class. New: 3d line plotting You can now draw in 3 dimensions as well as 2, and display a round the origin in 3d plots.
Python has also been ported to the Java and.NET virtual machines. The most up-to-date and current source code, binaries, documentation, news, etc., is available on the official website of Python https. You can start Python from Unix, DOS, or any other system that provides you a command-line interpreter or shell window. Enter python the. Apache Spark 2.3.0 documentation homepage. Users can also download a “Hadoop free” binary and run Spark with any Hadoop version. It’s easy to run locally on one machine — all you need is to have java installed on your system PATH, or the JAVA_HOME environment variable pointing to a Java installation.
New: Column Search function overhauled You can now using various wildcard options etc. New: More Gaia DR2-friendly astrometry functions Class contains expression language functions for calculating Cartesian components of position and velocity from Gaia-style astrometric parameters. Tutorial: Exploring Gaia DR2 data with TOPCAT and STILTS Available as. — Version 4.6-2 released 2 November 2018.
What is TOPCAT? TOPCAT is an interactive graphical viewer and editor for tabular data.
Its aim is to provide most of the facilities that astronomers need for analysis and manipulation of source catalogues and other tables, though it can be used for non-astronomical data as well. It understands a number of different astronomically important formats (including FITS, VOTable and CDF) and more formats can be added.
It offers a variety of ways to view and analyse tables, including a browser for the cell data themselves, viewers for information about table and column metadata, and facilities for sophisticated interactive 1-, 2-, 3- and higher-dimensional visualisation, calculating statistics and joining tables using flexible matching algorithms. Using a powerful and extensible Java-based expression language new columns can be defined and row subsets selected for separate analysis. Table data and metadata can be edited and the resulting modified table can be written out in a wide range of output formats. It is a stand-alone application which works quite happily with no network connection.
However, because it uses Virtual Observatory (VO) standards, it can cooperate smoothly with other tools, services and datasets in the VO world and beyond. The program is written in pure Java and available under the GNU, though some of the library code is LGPL.
It has been developed mostly in the UK within various UK and Euro-VO projects (Starlink, AstroGrid, VOTech, AIDA, GAVO, GENIUS, DPAC) and under PPARC and STFC grants. Its underlying table processing facilities are provided by the related packages. Features The following is a list of the program's main capabilities. The hyperlinks are to the relevant parts of the user document.
Fast access to (millions of rows/hundreds of columns). View/edit table in a scrollable browser. View/edit and metadata.
Re-order and hide/reveal. Insert ' columns defined by. on the values in a given column.
Define in. View interactive and configurable of column-based quantities against each other distinguishing different data sets:. Plot types are,. Features include,. Plots can be in bitmapped or vector formats, and a command to the same plot is displayed. Calculate on each column for some or all rows. Perform flexible and fast in the or tables.
the rows of existing tables to create new ones. Cause various when a row or plotted point is selected. with other applications using SAMP. tables from a, URL, or. Communicate with external VO and non-VO data services, including, or.
Perform multiple (per-row), or queries, to join a local to a remote catalogue or image/spectrum archive. Downloads TOPCAT is written in the Java language using the Java 2 Standard Edition version 6, and should run on any Java SE 6 or more recent system.
This means it can be run on a wide range of platforms, without requiring any recompilation - you just need to ensure that you have a suitable Java Runtime Environment (JRE). If you don't have Java installed, or have an unsuitable version, you can obtain the Java SE for Linux, Mac OS X, MS Windows and Solaris from (you only need the 'JRE' rather than the 'JDK' download, unless you will be doing development work). Java SE Runtime Enviroments (sometimes called JVMs or Java Virtual Machines) for other platforms may be available from operating system vendors.
Having got Java, There are several ways to download TOPCAT, described in rough order of advisability in the following subsections. More information on how to run the program having obtained it can be found in SUN/253's section on. Standalone Jar File The most convenient form for downloading is to pick up a single Jar file containing the required classes:. (31.0M) - core facilities plus some optional extras.
(24.4M) - core facilities (Note: if you try to download these directly your browser may say something about a failed security check. Make sure that you save it to a file, for instance by right-clicking in Firefox).
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On Unix-like operating systems, download one or other of these jar files and the startup script into the same directory, then ' chmod +x topcat', and you can just run the command: topcat On non-Unix systems the script won't work, and you can use a command like: java -jar topcat-.jar or invoke it in some other system-dependent way such as by clicking on it. For many users, topcat-lite will provide all the features they need. The optional extras provided by topcat-full include:. Treeview-like hierarchy browsing. SoG image viewer (though you still need for it to work). MySpace and SRB remote file browsing for table load/save Even topcat-full lacks a few of the niche features (proper coordinate handling in SoG, NDF viewing in hierachy view), since these require native libraries; for these you will need the Full Starjava installation described below. WebStart is a Java technology which enables one-click download, installation, updating and invocation of Java applications over the web.
If you have Java's WebStart installed, you can install and invoke TOPCAT in one click from one of the following links:. Webstart invocation: (31.0M), (24.4M) See the comments in the previous item for the difference between topcat-lite and topcat-full. When it works well, WebStart can make download and running very easy. Sometimes however it seems to cause trouble that is difficult to diagnose, so the is generally recommended instead.
MacOS X If you have an Apple Mac, you can pick up the following for easy installation: (38.6M) A couple of FAQ entries are relevant:. Full Starjava Installation If you want the most comprehensive installation then download and unpack the full starjava tree in one of the following forms:. (163.1M). (163.2M) These archives include related applications such as,.
You can run TOPCAT using the starjava/bin/topcat script (Unix) or by running java -jar starjava/lib/topcat/topcat.jar. Note that TOPCAT is also packaged as part of the bundle - see. Version History The most recent public release of TOPCAT is version 4.6-2, released 2 November 2018.
For a detailed history of the changes in this and previous releases, see the section of SUN/253. Further Information STILTS TOPCAT's sister package is, the STIL Tool Set. STILTS offers many of the same facilities as TOPCAT (and some additional ones) in the form of command-line tools, which can be invoked from the Unix/DOS command-line prompt, or from Jython.