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- #Introduction
- #Creating histograms in org.lcsim
- #Saving your work
- #Changing the layout
- #Basic Fitting
- #Advanced Tutorials
Here is a possible outline for this section:
- usage of the static AIDA defaultInstance
- explanations of basic types: clouds 1D/2D, histograms 1D/2D, tuples, etc.
- defining each type (e.g. bin sizes for histograms, etc.)
- filling each type
- creating plots from a sample Driver (use Analysis101 or some other template)
- changing axis label: text value, font, size, etc.
- changing axis range min/max
- changing to log scale
- changing filled/unfilled and colors for value bars, error bars
- modifying fields that show in statistics box
- saving and reloading plots using .aida files
- importing into a Powerpoint presentation
- basic fitting (would keep this pretty simple)
It would probably be best done with more than one page.
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Introduction
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For plotting and fitting, org.lcsim provides an implementation of the Abstract Interfaces for Data Analysis AIDA.
AIDA objects is organized in Trees, which can have a directory structure like a file system.
This tutorial will assume that you are working in JAS3 and have either loaded an existing AIDA file or created objects in AIDA with the org.lcsim plugin.. For a first introduction how to create AIDA objects, you could execute one of the AIDA examples or one of the org.lcsim examples in JAS3 or follow Explanation of Analysis101 Driver. If you have executed some of the org.lcsim examples in JAS3, you have already used AIDA in lines like these:
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AIDA aida = AIDA.defaultInstance(); ... aida.cloud1D("nTracks").fill(tracks.size()); |
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Teminology
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AIDA provides two different kinds of histograms: binned and unbinned.
Binned histograms are called IHistogram1D, IHistogram2D, IHistogram3D
for one, two and three-dimensional histograms.
Similarly, unbinned histograms are called ICloud1D, ICloud2D, ICloud3D
Getting started
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Class name of the AIDA object | Description |
IHistogram1D, -2D, -3D | One-, two- and three-dimensional binned histograms
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ICloud1D, -2D, -3D | One, two and three-dimensional unbinned histograms
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IProfile1D, IProfile2D | One- and two-dimensional profile plots
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IDataPointSet1D, -2D, -3D | Sets of one, two- and three-dimensional data points with errors
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ITuple | Tuple structure for persistence
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Viewing and Loading Plots
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Lets start with viewing AIDA objects. You can either create them with the AIDA examples, the org.lcsim examples or you can load an existing AIDA file with File->Open File...
in the menu.
All AIDA objects are arranged in trees. You can have many trees open at the same time; they are represented as Folders, . Trees can contain, e.g. Clouds and/or Histograms , with the name of the object appearing next to it. If a folder is closed, double-clicking will open it and display its contents. Similarly, double-clicking on an open folder will close it, so that the contents are hidden.
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In order to display an item together with an already displayed item, select Overlay on Current Plot
from the context menu
Saving your work
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Saving your plots as image files
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If you just want to include the plot in your presentation, you can copy it to the clipboard with |
JAS3 supports various graphics formats, for both bitmap and vector graphics.
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- Right-click on the plot and select
Plot Properties...
from the menu. You will see tabs that represent different regions of the plot. - The Title of the plot can be found under the General tab. Change it so something descriptive and click on the Apply button to see it change.
- The axis labels can be changed under the Y Axis and X Axis tabs, respectively. After entering the label in the text field, click the Apply button to see it change
Changing the axis range / log scale
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The axis properties can be found in the Plot Properties...
entry in the context menu, which you can bring up with a right-click. The Y Axis and X Axis tabs let you specify a range for the respective axis, as well as change the scale to logarithmic. Click the Apply button to make the change visible immediately.
Changing the appearance of the plot
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Changing the font
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You can change the font of the title or the axis labels. Open the context menu of the label you want to change by right-clicking on the text. The first item in the context menu is either Title Font...
or Axis Font...
depending on where you click.
Changing the color, line and filling options
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When overlaying two or more histograms, oftentimes important information is hidden behind the opaque histogram bars. In this case it is convenient to access the context menu with a right click and selecting Fill Histogram Bars
. More sophisticated changes can be made by accessing the Plot Properties...
dialog from the context menu. The Data tab shows all data sets contained in the current plot. Click each data set to access its options. After changing an option, click the Apply button to see the changes.
You can select for each data set whether you want to display it. JAS3 has also the option to plot a secondary Y Axis. You can select which of the two possible axes to associate your data with.
1D Plot Style/2D Plot Style
: This is where you change the color, line width and other display properties of each plot. Click apply after your changes to confirm that this is what you wanted.
Changing the statistics box
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You can select what information should be displayed in the statistics box by right-clicking on the statistics box and selecting Statistics Properties...
. If you want the statistics box to disappear completely, right-click on the main plot and select Show Statistics
. This entry is also used to make the box re-appear.
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There is currently no option in JAS3 to make the label box disappear. If, for some reason, you do not want to have it displayed, you can select it and resize it to a size of 0. |
Basic Fitting
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JAS3 provides some predefined functions.
- A Gaussian (3 parameters)
- An exponential (2 parameters)
- 0th, 1st and 2nd order polynomials (1, 2 and 3 parameters, respectively)
You can fit your data to one of these functions as well as to a sum of any combination of these.
SelectAdd function
from the context menu by right-clicking on the histogram
SelectFit
from the context menu and select the function you want to fit to the data.
The fit parameters will be displayed in the statistics box.
If, for some reason the fit has failed, you can access the parameters by accessing the Functions tab in thePlot Properties...
dialog, which you can access from the context menu.
The Functions tab lets you choose: - The display properties of the function curve
- The fit parameters with their error and an indicator whether they are included in the fit
- A box that lets you select the fitter and the dataset which to fit, as well as an indicator whether the fit was successful and the chi-Squared value of the fit.
Before re-fitting the function, make sure the indicators of all parameters that you want included in the fit are checked. You can modify the Values of each Parameters, which will then be used as the new starting point for the fit. Click the checkbox labelled Fit to uncheck it, then click it again to start the new fit.
For further information on fitting, please visit Fitting Through The GUI and Fitting Tutorial
Advanced Tutorials
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