Evoker is a graphical tool for visualizing genotype intensity data in order to assess genotype calls as part of quality control procedures for genome-wide association studies.
It provides a solution to the computational and storage problems related to being able to work with the huge volumes of data generated by such projects by implementing a compact, binary format that allows rapid access to data, even with hundreds of thousands of observations.
[The Wellcome Trust Sanger Institute]
Evoker is an open source project hosted on SourceForge.
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Q: How do I launch Evoker for Windows?
A: Download Evoker from SourceForge (see 'Downloads') and unzip the install bundle then simply double click
the Evoker.exe file in win folder.
Q: How do I launch Evoker for Mac?
A: Download Evoker from SourceForge (see 'Downloads') and unzip the install bundle then simply double click
the Evoker.app file in mac folder.
Q: How do I launch Evoker for Unix?
A: Download Evoker from SourceForge (see 'Downloads') and unzip the install bundle then simply double click
the Evoker.jar file in other folder.
Q: How do I load a remote data set?
A: To load a remote data set select Connect to remote server from the File menu. Fill in the resulting pop-up with
the following information:
Q: How do I generate a marker list?
A: An Evoker marker list is simply a plain text file containing each marker ID (the ID you use must match the ID used
in the collection bim file) on a separate line.
Q: Where will my scores be saved?
A: Evoker writes the scores you have recorded into a file with .scores appended to the name of the marker list you
loaded.
Q: How do I use the zoom feature?
A: You can zoom in and out of the plot either using the right click menu or by clicking and dragging (down and to the
right creates a 'zoom in box', while up and to the left zooms back out again).
Q: How can I identify the sample name of a point on the plot?
A: Holding the pointer over the point of interest will show which sample corresponds to that point.
Q: How do I save an image of all the displayed plots?
A: To save a png image of all of the plots displayed in the Evoker window select Save SNP Plots from the File menu
and enter your desired save location.
Q: How can I save an image of an individual plot?
A: To save an image of an individual plot right click on the plot of interest and select Save as… from the menu that
appears then select your save location.
Q: What do I do if Evoker runs out of memory?
A: If Evoker needs more memory to load a data set then users can launch the program with additional memory from the
command line by issuing the following command (increasing the –Xmx value as necessary):
java -Xmx1024m -jar Evoker.jar
Q: Where can I find the Evoker documentation?
A: The evoker documentation can be downloaded
from SourceForge and is also included in the download package.
For questions or comments, please contact James Morris or Jeff Barrett.