Export point coordinates from (r)ggobi scatterplot

[Robin P]

Hi List,

I'm not familair with ggobi nor with R but one of my colleagues non familiar with GIS is looking for a way to get his colored scatterplots in a mapping interface, for example QGIS.

For example, we would like to try and find a way to link ggobi to QGIS via the R module included.

My first question for the R or for the ggobi specialists : is there any way to export for instance X,Y,color or X,Y, attribute listing ?

Thanks for any clues,

Robin.

[Nicholas Lewin-Koh]

Hi Robin,

The way i would approach it is look at Rpy2. Rpy2 encapuslates R objects in python and allows you to use them as either python structures or R stuctures. Qgis has facilities for python plugins. It shouldn't be too hard to link R and Qgis directly (he said) using Rpy2 as the "glue".

 

That being said, I think the describeDisplay command in Rggobi will get you the coordinates from a ggobi display, and then use write.csv to export them.

 

Nicholas

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[Robin P]

Dear all,

First I'd like to thanks you for your detailed and quick answers. I'll forward all that to my colleague so we can work on a way to get it done.
I'll keep in touch here if we manage to do the trick and get a proper export. I'll have to wait the next project for that.

In the meantime, again, thank you.

Robin.

Expéditeur: Michael Lawrence
Date: 4 juin 2014 14:29:10 UTC+2
Cc: GGobi users
Objet: Rép : [GGobi] Export point coordinates from (r)ggobi scatterplot

Assuming you have a GGobi instance in R called "gg", you can retrieve the displays and the variable names of a given display. For example, assuming you have one display that is the scatterplot,

scatterplot <- displays(gg)[[1L]]
varnames <- variables(scatterplot)

gets the variables names.

Assuming your dataset is named "data", the data are retrieved with:

d <- gg$data
df <- as.data.frame(d)

and the glyph attributes like this:

colors <- glyph_color(d)
sizes <- glyph_size(d)
types <- glyph_type(d)

Hope that helps,

Michael