Schutz, B.

Taylor, I.

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Triana   A Quicklook Data Analysis System For Gravita tional Wave DetectorsIan Taylor  Bernard Schutz Department of Physics and Astronomy  University of Wales Cardi  PO BOX  Cardi  Wales  UKAlbert Einstein Institute  Max Planck Institute for Gravitational Physics  Schlaatzweg  Potsdam  GermanyAbstract  In this paper  we present an overview of the Triana OCL object connecting language data analysis environment Triana is an extension of Grid  introducedlast year  that allows users to interactively build complex data processing systems byselecting a set of desired tools and connecting them together graphically  IntroductionSignalprocessing systems are becoming an essential tool within the scienticcommunity This is primarily due to the need for constructing large complexalgorithms which would take many hours of work to code using conventionalprogramming languages Triana Object Connecting Language is a graphicalinteractive multithreaded environment allowing users to construct complex algorithms by creating an objectoriented block diagram of the analysis required An OverviewWhen Triana is run three windows are displayed A ToolBoxwindow  aMainTri ana window and a Dustbin window to discard unwanted units Figure  showsthe ToolBox window which is divided into two sections The top section showsthe available toolboxes found by scanning the toolbox paths specied in theSetup menu and the bottom shows the selected toolboxs contents Toolboxesand associated tools can be stored on a local server or distributed throughoutseveral network servers Simply adding the local or http address in the toolboxand tool path setup allows onthey access to other peoples toolsUnits are created by dragging a units icon from the ToolBox window anddropping it at the desired position in the MainTriana window Units are thenconnected together by dragging from an output socket on a sending unit to aninput socket of the receiving unit Algorithms are run by clicking on the startbutton see Figure 	 located at the bottom righthand side of this windowAlgorithms can be run in one of three modes  in a single step fashion ieone step at a time continuously ie each unit running continuously or inFigure  Trianas ToolBox window Toolboxes can be organised in a similarway to les in a standard le managercontinuous step mode where the units are run continuously but synchronised ateach time step Overview of the ToolboxesThe following toolboxes are currently available within Triana   Algorithms  this contains a number of signal processing routines egFFTs  amplitude and power spectral algorithms  averagering and statsticalunits  noise adders ieGaussian  complex number routines  automaticnumber padders and frequency low and highpass lters  Applications  this currently contains MathCalc see section  but it willlater be used to incorporate other applications into Triana  Converters  converting units allow the user to convert between thevarious types within the Triana system For example  a user could load ina set of raw samples using the Importer unit ie into RawData objectand then pass this RawData into a RawToSSet unit in order to specifythe sampling rate and add a description etc  Demos  various demos of connected networks ie groups within TrianaUsed to demonstrate to users how the various units are connected togetherWe also have another demo toolbox  called CalcDemos This containsexamples of using and connecting the MathCalc unit within networks  InputUnits  these are units which generate data somehow or import datainto Triana from other sources eg les We have wave generators  textand binary importers  	dimensional data set importers and generatorsand a unit to generate a constant useful for setting parameters for otherunits  OutputUnits  these are units which output data somehow or displaydata Here we have text and binary exporters  	dimensional graphicaldisplayers  a Grapher for displaying sample sets and spectra and viewersfor constants a simple text eld view and text ie via an editor wevecreated called Ved  Comms  consist of units Client and Server which allow two versionsof Triana to communicate with each other via internet sockets and a unitExec which can run and communicate with any executable  Exec communicates with executables by using standard input and output streams  ImagProc  contains various image processing algorithms There exist units which can alter the brightness  colour intensities  convert fromcolour to black and white  edge detection  contrast enhancers  blurrers convolvers  image adders and subtracters  image negaters etc  Image  consist of a set of tools which allow the loading in and displayingof GIF or JPEG les  Animation  here we have a set of tools which allow you to animate a setof GIF or JPEG les and control the animation speed  Maths  consists of a set of standard mathematical functions which workon the various types within Triana eg Ln  Sqrt  Exp  Magnitude  Square Sine  Sinh  ArcCos etc  Logic  currently just contains an If unit which tests its rst input androutes the second input to either the rst or the second output accordingto the outcome of the test Other logic units are planned for the nalrelease of Triana  SunAudio  contains a demo unit which allows users to speak or sing into their Sun workstation have this input into Triana  DTPTools  these are a set of tools which allow a number of desktoppublishing tasks to be performed within Triana There is a general wayof producing listings of les using wildcards throughout subdirectoriesThis means that you can process all matching les with any of the toolsFigure 	 A snapshot of Trianas programming windowwithin this toolbox For example  you could count the lines of all thejava code within a source directory and all its subdirectories  change alloccurances of one word with another or even list les with line numbersof all les containing a phrase like grep New Features Of TrianaGroups of units can now be saved along with their respective parameters Suchgroups can also contain groups  which can contain other groups and so on Thisis a very powerful feature which allows the programmer to hide the complexityof programs and use groups as if they were simply units themselves Manyimprovements have been made to the graphical interface  including compactingthe look and style of the toolbox  adding a snapto cable layout and many moreinformative windows The major change however  is that now Triana consistsof an object connecting language OCL and a separate user interface Thismeans that the units can be run from within the user interface or as a standalone programFigure  MathCalcs parameter window MathCalcThe MathCalc unit interprets  optimises and evaluates arithmetic expressionsusing streamoriented arithmetic It recognises a large number of functions andconstants It can be used to evaluate scalar expressions  to process input datasets  or to generate output data sets All calculations are performed in doubleprecision real arithmeticStreamoriented arithmetic can be dened as the application of an arithmetic expression to each element of a stream independently Thus  if B isthe sequence b  b	    bn  then the function sinB evaluates to the sequencesinb  sinb	    sinbn MathCalc distinguishes between constants and se quences or sets Sets data sets are sequences of numbers and constants aresingle numbers  essentially sequences of length  In a MathCalc expressionthe two can be mixed very freely  with the restriction that all sequences musthave the same length Sequences or constants can be obtained from the inputnodes of the MathCalc unit The example given in the MainTriana window seeFigure 	 demonstrates the exibility of the MathCalc unitThe rst MathCalc unit creates a 	 Hz sine wave by using the equationsinsequence		PI	 where the sample rate is kHz MathCalcwill optimise this to sin	PI	  sequence	  see Figure  MathCalcs user interface allows users to type in any mathematical expression Thisexpression is then optimised when the user hits return and the optimised expression then appears in the bottom text eld The user can choose to showthe optimised expression or to hide it see Figure  for the MathCalc parameterwindow without the optimised expression shownThis sine wave is then transformed into a SampleSet type by adding itsFigure  RawToSSets parameter windowFigure  MathCalc	s parameter windowsampling frequency ie  kHz within the RawToSSet unit RawToSSet  seeits parameter window within Figure The second MathCalc unit adds Gaussian noise to its input ie by typinggaussian	s in MathCalc	s parameter window  see Figure  The means node  and the s means that it is a sequence as opposed to a c whichwould a constantThis noisy signal is then passed to the FFTASpect group see Figure  Thisgroup consists of an FFT unit FFT and a unit which converts the complexset of data  generated by the FFT  to an amplitude spectrum AmpSpectGroups  such as the FFTASpect can be created very easily within TrianaSimply by choosing the units to group and selecting Group from the Edit menuor from a popup menu will group the units and create a Group edit windowfor them This can be performed again within the group edit windows to havegroups of units within groups of units and so on Very complex algorithmscan be created and broken down in this way This amplitude spectrum is thendisplayed by Grapher see Figure Once the signal is displayed  it can be investigated further by using one ofthe Graphers various zooming facilities or displayed dierently by choosing oneFigure  The internal structure of FFTASpects group The outside unitsmathCalc	 and Grapher are simply labels indicating which units they areconnected to in the next level up ie within the MainTriana window see Figure 	Figure  Graphers outputFigure  Graphers parameter windowcombination of line styles or colours Any grapher can simultaneously displaymany signals up to 	 nominally each with its own colour and line style Thiscan be set using the Graphers parameter window shown in Figure  belowEach input node to the grapher can be displayed in one of thirteen dierentcolours and in one of three dierent line styles  continuous as in Figure  scattered ie just dots for each point or impulse vertical lines from the pointto the xaxisZooming can be controlled via a zoom window which allows specic rangesto be set see Figure  or by simply using the mouse to drag throughout theimage For example  by holding the control key down and dragging down theimage is zoomed in vertically and by dragging across from left to right zoomedin horizontally The reverse operations allow zooming out Also once zoomedin  by holding the shift key and the control key down the mouse can be usedto move around the particular area you are interested in We also have anotherpowerful zooming function which literally allows the user to drag to the positionof interest and the image will zoom in accordinglyUsing the zoom window  precise zoom regions can be specied by insertingthe desired ranges in the top four north  east  south and west texteld boxesThere are options to retain the current zoom ranges when displaying furtherimages and to specify which directions you want to zoom into These take eectwhen the mousedragging functions are used The two buttons at the bottomallow the user to zoom into  of the image Half Size or to return to thefull size of the image Full Size Other useful features of the Grapher are to beable to change the distance between ticks and to view the data logarithmicallyin either vertical or horizontal directions Current Version Of TrianaTriana originated from an implementation of the system using C and InterViews  but was abandoned in early  Version two 	 was written usingthe Java Development Kit  JDK 	 but this was updated in order to be compatible with the new JDK x kit We also reimplemented the base classesFigure  Graphers zoom windowand created OCL This version of the software was called Grid OCL  but inNovember  we changed its name to Triana which is now a UK trademarkIt is a late alpha version and all information relating to the software can befound on the internet site  httpwwwastrocfacukTriana Triana OCL willbe entering its beta testing stage early  followed by a nal version shortlyafter We are in the process of being able to provide a commercial version of thesoftware for which support can be given Nonetheless we will always provideit in a free downloadable from the WWW with a certain time limit  or months and to the gravitationalwave community Our main goal is to createa very wide user base and get people involved in writing and using there ownunits as well as our ownSo far  collaborators are working on tools for various signal and image problems  multimedia teaching aids and even to construct a musical compositionsystemReferences Taylor I J   Schutz B F  		 The Grid MusicalSignal Processing System International Computer Music Conference  p  Taylor I J  Schutz B F  		 The Grid Signal Processing System Astronomical Data analysis Software and Systems VI  p  Taylor I J  Schutz B F  		 Grid OCL  A Graphical Object ConnectingLanguage Astronomical Data analysis Software and Systems VI  p 

Triana - A Quicklook Data Analysis System for Gravitational Wave Detectors

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Triana - A Quicklook Data Analysis System for Gravitational Wave Detectors

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