I read this post that thought it would be very easy and just what I need to produce some graphs. However not quite so easy as I am on Windows. I tried gem install rmagick-win32 but then I went here to get the rmagick instructions.
http://rmagick.rubyforge.org/install-faq.html
Which worked straightforwardly. I had previously installed imagemagick on my system. So now hopefully gem install gruff will work. Now had a problem with the rmagick expecting to be:
C:\ruby\lib\ruby\gems\1.8\gems\rmagick-2.9.0-x86-mswin32\ext
which was due to not rebooting my computer.
The documentation is here. I have been trying to draw a side bar with +ve and +ve variations for our daily email:
However I couldn't initially get the numbers to go negative. However with sources soon have knocked up:
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