Understand 2D plots in MantidPlot better

[Anders Markvardsen]

Understand 2D plots in MantidPlot better. If say a 6 by 6 matrix is plotted, does it plot it on a 7 by 7 grid or a 6 by 6 grid.

1) Plot a small histogram workspace say chopped to 4 histograms each containing 4 bins. Since this is a histogram it means the x-values are bin boundaries and 5 x-values are stored. Understand how MantidPlot grids such a dataset for plotting. (Note MantidPlot build on top QTIPLOT, and currently it is not understood how QTIPLOT does the gridding for 2D plots).

2) Take the above workspace and run it through the algorithm ConvertToPointData, which will convert the workspace to a point data workspace, i.e. in this case there will now be 4 x-values instead of 5. 2D plot this workspace and see if what gridding is used.

[Karl Palmen]

First I need to understand what is meant by a bin. The wikipedia article ​http://en.wikipedia.org/wiki/Bin_(computational_geometry) does not provide a good introduction and so is confusing. Have you any book or web page that could be of help?

[Karl Palmen]

Using the cropworkspace and rebin algorithms, I've created a 4x4 nexus file which I attach.

[Karl Palmen]

4x4 plot for use with this ticket

[Karl Palmen]

argcrop2a after the ConvertToPointData algoithm has been applied.

[Karl Palmen]

I've also found that the 3D wireplot is a few bins to the right of where it should be. This does not matter for large plots, but for the small ones here the right most part of the wireplot is not shown.

[Jean Bilheux]

Works perfectly for me.

[Stuart Campbell]

This ticket has been transferred to github issue ​4855