Re: [Gnuplot-info] Question on Plots on Non-regular Grid

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Lorenzo Isella wrote:

> I am fairly new to data plotting and visualization.

> I would like to make a 2D contour plot using colors such that one can see
> that the domain where I am plotting is actually a circle.

That's going to be a little tricky.  In particular, the seam where theta 
jumps by 2*pi will be apparent in the plot.

> Furthermore, I do not have necessarily an equally spaced grid.

It doesn't have to equally spaced as long as it's topologically 
rectangular, i.e. consists of N rows of M entries.  You have to inform 
gnuplot about where one row ends and the next one begins.  See 'help 
glossary' and 'help datafile' and watch out for 'grid structure'.