Basic Examples

Create a “random” FCGR image using a pseudorandom string of nucleotides:
SeedRandom[12345678];​​charstring=ToString[RandomChoice[{"A","T","C","G"},2000]];​​
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FCGRImage
[charstring,ImageSize200]
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Show simple images using sequences of the same nucleotide repeated three times:
GridPartitionMap
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FCGRImage
[#,4,ImageSize200]&,{"AAA","TTT","CCC",",GGG"},2
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The off-center asymmetry seen above is perhaps more apparent when we use sequences of length four:
GridPartitionMap
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FCGRImage
[#,4,ImageSize200]&,{"AAAA","TTTT","CCCC",",GGGG"},2
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The asymmetry can be removed using the option setting
"Centered"->
True
:
GridPartitionMap
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FCGRImage
[#,4,"Centered"True,ImageSize200]&,{"AAAA","TTTT","CCCC",",GGGG"},2
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Scope

Select a human gene from the Wolfram Language curated data:
gene=GenomeData["SCNN1A","FullSequence"];
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Show the Chaos Game Representation image for this gene:
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FCGRImage
[gene]
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Show this gene at higher levels of pixelation:
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FCGRImage
[gene,8]
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One may observe a fractal nature to these, with similarities appearing as the resolution level is increased:
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FCGRImage
[gene,9]
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Compute the image with respect to a square having the purines positioned at the bottom vertices and the pyrimidines at the top:
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FCGRImage
[gene,8,{"A","G","C","T"}]
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Reverse the order of the purines from the default ordering:
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FCGRImage
[gene,8,{"G","T","A","C"}]
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