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An arbitrary example:

Create a random image

Image[RandomReal[{0, 1}, {10, 10}], ImageSize -> Medium]

enter image description here

Define some points and a graph to align

c = PixelValuePositions[%, White, .1]
RandomGraph[Table[Length[c], 2]]

enter image description here

Out[1]: {{2, 9}, {1, 8}, {1, 7}, {2, 7}, {9, 6}, {2, 2}}

How can I align the nodes of a graph to coordinates on an image?

Ideally this would be a graph from a correlation matrix

RandomReal[{-1, 1}, Table[Length[c], 2]] // MatrixForm
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1 Answer 1

Reset to default
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$\begingroup$ 
SeedRandom[1]
img = Image[RandomReal[{0, 1}, {10, 10}], ImageSize -> Medium];
c = PixelValuePositions[img, White, .1];

rg = RandomGraph[Table[Length[c], 2], ImageSize -> Medium];

rg2 = SetProperty[rg, 
   {VertexCoordinates -> c - 1/2, EdgeStyle -> Directive[Red, Thick]}];

Row[{rg, Show[img, rg2]}]

enter image description here

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2
  • $\begingroup$ How can I remove the self lines from a WeightedAdjacencyGraph[] of a correlation matrix? it seems the removal in the help is done by setting to infinite but this seems there may be a setting I can not see $\endgroup$
    – Teabelly
    Mar 31, 2021 at 15:00
  • 1
    $\begingroup$ @Teabelly, replacing 0's with Infinitys is the only way I know. $\endgroup$
    – kglr
    Mar 31, 2021 at 19:48

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