Use R to export data from Power BI

Edit 03 Aug 2016: With the July 2016 release you can now run your R-scripts directly in the query-editor (so no row-limit any more!). No need to go via the visuals. But this will limit you to export datasets from the query-editor, so no DAX.

Edit 22 Jan 2016: Currently this method is limited to 150k rows! It will drop all others without warning!

Edit 25 Jan 2016: 150k rows is the limit on all R-scripts at the moment (link). A warning sign will be shown on the image. Will create a new blogpost if this changes – so stay tuned (by following this blog, Twitter or LinkedIn)

With the December release, Microsoft enabled Power BI’s content to be fetched from the R-feature. So instead of plotting this data to the screen, could we just export it to a file?

Yes we can:

write.table(trim(dataset), file=”your filepath & filename.txt”, sep = “\t”, row.names = FALSE);

write.table has a lot of options, which are explained here. I’ve only used a few here: Exactly defining the location where the output-file shall be stored (file=), setting tab as delimiter (sep=”\t”) and skipping row names, which would be an index in our example here.

In addition to that, I had to get rid of trailing whitespaces that somehow sneaked into the table (trim(dataset)). Therefore the gdata-package is needed. So the full R-code looks like this:

require(gdata)
write.table(trim(dataset), file=”your filepath & filename.txt”, sep = “\t”, row.names = FALSE)
plot(dataset);

Here you have to make sure to turn the slashes in the filepath: So if your path looks like this: C:\Users\Imke\Desktop\Rfile.txt you need to write it like this: C:/Users/Imke/Desktop/Rfile.txt

Let’s take this as a start that will probably fulfill many users need to quickly export data from Power BI to simple text files. Further use cases I see are:

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Visualize dependencies between your DAX measures: DAX-VizArt-Wizard

This DAX-VizArt-Wizard vizualizes dependencies between your DAX measures, shows the definition of all related measures and shows differences between the measures of 2 models/versions. This works for Power Pivot, Power BI and for Analysis Services Tabular (SSAS).

In the Power BI-Version you’ll see them in the Sankey-chart like this:

VizArt1

If select measures/nodes, all direct connections will be highlighted:

VizArt2Direct

In the second version, all indirect connections will be highlighted as well & the selected measure definitions will be shown.

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