QQ plot

Dear All,

I am working with “QQ-plot grid” installed in the R-server. But, it does not work, the template is not shown when I click “Apply” to run the template.

I have got this message “WARN R Plot 0:11 failed to apply settings: java.lang.NullPointerException”

I am working with Windows10. In Prefereces/R-scripting, Rserve is as “localhost”, and I have R located at “C:/Program Files/R/R-3.5.1/bin/x64/Rgui.exe”.

Any idea why q-q template does not work??



could you please provide me with your script (maybe even your workflow) and the version numbers of your R, R-serve and any other involved library that you are using?


Hi Mark,

These are the versions that I am using

R.version _
platform x86_64-w64-mingw32
arch x86_64
os mingw32
system x86_64, mingw32
major 3
minor 5.1
year 2018
month 07
day 02
svn rev 74947
language R
version.string R version 3.5.1 (2018-07-02)
nickname Feather Spray
[1] ‘1.7.3’
Knime version:KNIME 3.6.1
S.O. Windows10

This is the script I try to run:

And, here you are the KNIME message

Thanks a lot for your help in advance


sorry it took me so long to get back to you.

Just to make sure we are on the same page.
What you did is add a R plot node to your workspace and then you selected from the templates screening/qc/QQ-Plot grid and then hit the Apply-Button? At least this way I was able to reproduce your problem.

The thing is that this is a problem of the scription-extension (that’s why I moved the post here) and not possible to get rid of without any code changes. However, there seems to be a work around.

  1. Add a R plot node to your workspace
  2. Select a random template, e.g., basic/cdf/Cumulative Density Function
  3. In the Script Editor select unlink from template
  4. Go to the templates tab and select screening/qc/QQ-Plot grid
  5. Click apply

Hope this works for you.

Hi Mark,

Thanks a lot for your time. Unfortunately, it does not work, :frowning:
I have tried your procedure, but the plot I get is only the “Cumulative Density Function”.
I have seen the same problem with:/R Snippet/distributions/Shapiro-Wilk Normality Test (QQ-Plot)


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