Can someone explain me what does this subdivision means (ggplot2) bar_plot

[Cesar Ruiz]

Hi everyone,

when running these lines

A5<-plot_bar(Spo_Caribe, fill = "Class")
A5 + geom_bar(aes(color = Class, fill = Class), stat = "identity", position = "stack")

i got this graph



I would like to know what does means de subdivisions inside the table, I mean this kind of subgroups marked by white lines between my samples.



thanks for your help



César

[Zack Weinberg]

On Tue, Aug 23, 2016 at 6:36 AM, Cesar Ruiz <cr...@natalesoft.com> wrote:
>
> I would like to know what does means de subdivisions inside the table, I mean this
> kind of subgroups marked by white lines between my samples.

I don't think it means anything; I think it's a rendering artifact.
Do the positions of the white lines change if you change the width of
the plot?

zw

[Cesar Ruiz]

Zack, yes in fact subdivision changes with the width....
Maybe it means nothing....

but if someone has another idea, is welcome
Thanks, 
César

 

zw

[Roman Luštrik]

How about this?

http://stackoverflow.com/questions/31905926/ggplot2-how-to-reduce-space-between-narrow-width-bars-after-coord-flip-and-pa

Cheers,

Roman

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[Zack Weinberg]

On Aug 23, 2016 8:08 AM, "Cesar Ruiz" <cr...@natalesoft.com> wrote:
>
>
>
> El martes, 23 de agosto de 2016, 13:43:25 (UTC+2), Zack Weinberg escribió:
>>
>> On Tue, Aug 23, 2016 at 6:36 AM, Cesar Ruiz <cr...@natalesoft.com> wrote:
>> >
>> > I would like to know what does means de subdivisions inside the table, I mean this
>> > kind of subgroups marked by white lines between my samples.
>>
>> I don't think it means anything; I think it's a rendering artifact.
>> Do the positions of the white lines change if you change the width of
>> the plot?
>>
>
> Zack, yes in fact subdivision changes with the width....
> Maybe it means nothing....

I believe what's going on is, ggplot is trying to leave a thin gap between *each bar* and its neighbors, but because your plot is so dense, the screen is only showing some of them. Which ones are visible is pure accident, a beat frequency of the bar width and the screen resolution.

Experiment with the size= parameter to geom_bar; if I remember correctly, this controls the width of the bars. If you don't want gaps at all, geom_raster may be more cooperative, but you might have to reorganize the data for that to work.

zw