Gitools accepts several easy to prepare formats to represent matrices. See this section of the userguide for more details on the different formats. All of them could be easily prepared using spreadsheet editors. Just save the file as “Tab separated file” and it will be ready to be used in Gitools.
For example, Continuous data matrix (CDM) file format is commonly used for expression microarray data. If you have a file with your microarray data in excel format, for example like this:
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If you leave the extension .txt it will also work in Gitools, but you will have to specify that it is a CDM.
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