Temperature/colored plot for not rectangular domain

[iamorozov1 (Ivan Morozov)]

Hi,

I have a list of the form {{x1,y1,z1},{x2,y2,z2}, … } where xi and yi form rectangular n x n domain.
In this case ArrayPlot[] gives me what I need:

Then there is a function that transforms xi and yi into:

How this not rectangular domain can be “painted” with zi vals?

I.M.

[seanc (Sean Clarke)]

For most functions, you can “paint” the colors of things using ColorFunction. Sometimes it takes effort to define the ColorFunction. In this case, it’s a bit annoying. I would suggest just drawing the points with Graphics Primitives

Here’s some example data:

rnddata = RandomReal[1, {50, 3}]

We need to turn the first two numbers of each triple into a Point and the last number into a Hue preceeding that Point

rnddata /. {x_, y_, c_} -> {PointSize[Large], Hue[c], Point[{x, y}]}

To finish this, we wrap it in Graphics:

Graphics[rnddata /. {x_, y_, c_} -> {PointSize[Large], Hue[c], Point[{x, y}]}]

You might also consider using ListDensityPlot.