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Here is my code:

data = Table[{i, j, RandomInteger[{1, 10}]}, {i, 5}, {j, 5}];
thePlot = ListPlot3D[Flatten[data, 1], InterpolationOrder -> {0}]

How can I make the data at one point, say (3,4), a different color. I want to highlight that data.

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data = Table[{i, j, RandomInteger[{1, 10}]}, {i, 5}, {j,  5}];      
ListPlot3D[Flatten[data, 1], InterpolationOrder -> 0, 
          ColorFunctionScaling -> False, 
          ColorFunction -> Function[{x, y, z}, 
                            If[ChessboardDistance[{x, y}, {3, 4}] <= .5 && 
                               z == Last@data[[3, 4]], Red, Blue, Green]]]

Mathematica graphics

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thePlot = 
 Show[ { ListPlot3D[Flatten[data, 1], InterpolationOrder -> {0}], 
     Cuboid[# - {0, 0, 1/100}, # + {1/2, 1/2, 1/100}] &@
      Flatten[data, 1][[3]]}]

enter image description here

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your solution is robust. – garej Mar 8 at 6:35

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