Question

I have a matrix {{2, 1, 2, 2, 1}, {1, 3, 0, 1, 2}, {3, 3, 0, 3, 1}, {1, 1, 2, 1, 1}}, and I want to generate a 3d plot such as there are a total of 4*5=20 bars.

There is a bar of height 2 based at the little square (1, 1) (i.e. the square formed on the x-y plane by the points {{0,0},{0,1},{1,1},{1,0}}),

another bar of height 1 based at the little square (1,2) (i.e. the square formed on the x-y plane by the points {{0,1},{0,2},{1,2},{1,0}}),

…

another bar of height 3 based at the little square (2,2) (i.e. the square formed on the x-y plane by the points {{1,1},{2,1},{2,2},{1,2}})

…

and another bar of height 1 based at the little square (4,5) (i.e. the square formed on the x-y plane by the points {{3,4},{4,4},{4,5},{3,5}})

I cannot find an easy way to do this. Thanks a lot for your help!

Answer 1

data = {{2,1,2,2,1}, {1,3,0,1,2}, {3,3,0,3,1}, {1,1,2,1,1}};

BarChart3D[data, ChartLayout -> "Grid", BarSpacing -> 0]

Edit

Updating after wiki-specifying the question :

BarChart3D[data, ChartLayout -> "Grid", BarSpacing -> {0, 0},
                 LabelingFunction -> (Row[{#1, Reverse[#2 - 1], Reverse[#2]}] &), 
                 AxesLabel -> {"x", "y", "z"}]

Here the both x and y-spacings vanish. Setting the cursor on a given bar you get z{x_min,y_min}{x_max,y_max}, on the top-red i.e. : 2{4,1}{5,2}