Trix Indices

A Trix index consists of a pair of files that allow for fast look-up of free text associated with a list of identifiers. The index is created from a single line-oriented text file using the program ixIxx. Each line in the text file starts with an identifier, followed by free text associated with the ID. For a more complete description of how to make a searchable track hub (or custom track), please visit the Quick Start Guide to Searchable track hubs.

To complete the steps below you must first download the ixIxx utility. For more information on downloading our command line utilities, see these instructions.

To create a Trix index, follow these steps:

1. Prepare a text file that associates your IDs with free text:
   

       id1 this is text for id1
       id2 this is text for id2
       id3 this is text for id3

2. Run the ixIxx program on your text file.
   

       ixIxx input.txt myTrix.ix myTrix.ixx

If you want to use your Trix index in a track hub, see the searchTrix setting in the Track Database Definition Document or the Quick Start Guide to Searchable track hubs for more information.