Circos > Documentation > Tutorials > Ideograms > Filtering
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2 — Drawing Ideograms

3. Filtering

To remove ideograms from the image, the "chromosomes" and "chromosomes_display_default" configuration parameters are used.


If this is set, then any ideograms not explicitly excluded will be drawn. Setting this flag is useful if you want to exclude a few ideograms, but draw the majority of others.


This field is used identify which ideograms to draw and/or exclude. When referring to ideograms, always use the ID of the ideogram as defined in the karyotype file (not the ideogram's text label).

For example,

chromosomes = hs1;hs2;hs3

will draw only the ideograms listed. To exclude an ideogram, preceed the ID with "-". Thus, to draw all ideograms but exclude those drawn above

chromosomes = -hs1;-hs2;-hs3
chromosomes_display_default = yes

The order in which the ideogram IDs appear in the "chromosomes" parameter does not influence the order in which they are drawn. To apply a different order, use chromosomes_order, discussed in another tutorial. Without specifying the order, the ideograms are drawn in the order of appearance in the karyotype file.