Question: Understanding the height in sashimi plots made by Gviz
gravatar for Leonardo Collado Torres
23 months ago by
United States
Leonardo Collado Torres610 wrote:


A colleague of mine asked me what the height in the sashimi plots created by Gviz represents. It was not intuitive and I dug around quite a bit before coming to the following conclusions:

* the height of an arc is not informative, it's just for graphical purposes. 

* the Y-axis on the sashimi arcs shows the relationship between the line width the the number of reads spanning a given junction.


Below is a screenshot of the Gviz 1.8.0 (Bioc 3.4 release) vignette. It's not initally clear why the arcs have different heights.

I did look at the vignette, the documentation, the sashimi plot paper and the code. Eventually I understood that the code at is for determining the height of the sashimi track (how much space is needed for the plot) and that the score (or scaled score) was not really used for that part since `.sashimi.junctions()` is called later on That's when I realized the meaning of the Y-axis label (which is not part of the original sashimi plot paper).

So, I just want to make sure that we got the interpretation correctly of the arc heights. If so, it'd be great if this information was described in the Gviz vignette (and maybe also the R docs).





ADD COMMENTlink modified 23 months ago by Robert Ivanek530 • written 23 months ago by Leonardo Collado Torres610
gravatar for Robert Ivanek
23 months ago by
Robert Ivanek530
Robert Ivanek530 wrote:

Hi Leo,

It is correct, I added the information into vignette. Sorry for not putting it there before.



ADD COMMENTlink written 23 months ago by Robert Ivanek530

Awesome, thank you for verifying my guess and for adding the information to the vignette. And no need to apologize, I know that documentation is a continuous process. Thanks again!

ADD REPLYlink written 23 months ago by Leonardo Collado Torres610
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