Open+Source+Heatmaps

Heatmaps can be created with two free open source Java programs: Cluster 3.0 and Tree View. First enter your data in Excel in a straightforward format, and then save the file as tab delimited text file. Open this text file in Cluster 3.0, choose how you want to cluster the data, output the data, open the output file from Cluster 3.0 (cdt file) in Tree View, set any options you want, and then export the image file.