Thanks :). I really don't know why I haven't found it.
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In Excel 2003 there is conditional formatting, which color cells according to their value. I've found it could be fast way to create a heatmap for gene expression visualisation.
Problem: I can't figure out how to remove values and keep colors only. My first quess was "paste special" but It won't work. Is it possible without using macros?
Quick Google search: http://superuser.com/questions/196059/how-to-hide-number-but-keep-excel-cell-background-color
Thanks :). I really don't know why I haven't found it.
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Just know excel will roger up any of your gene symbols that it thinks are dates. Why not use something nice like R to make your heatmaps? There's lots of beautiful examples.
http://flowingdata.com/2010/01/21/how-to-make-a-heatmap-a-quick-and-easy-solution/
http://www.r-bloggers.com/drawing-heatmaps-in-r/
Yes, I've read about Excel's problems with gene symbols. In fact I've newer encounter that problem with gene symbols, rather with decimals.
Normally I'd make my pictures with R, but I need to make (and possibly re-make) some pictures really fast. I don't have enough experience nor time to learn new things now. But the links would be helpful in future.