matplotlib bar3d没有正确绘制点

Question

我正在关注此帖Parameters required by bar3d with python以了解bar3d的参数。该图表与数据吻合，但绘图不准确。我期待0,0正好在0,0。此外，dx = 0.1和dy = 0.1应该显示方形印象，但不是。

以下是数据

   - { x: -3.6,   y: -0.019,   occurence: 676 }
   - { x: -3.10,  y: -0.0999,  occurence: 676 }
   - { x: -1.9,   y: -0.0999,  occurence: 676 }
   - { x: -0.07,  y: 0.,       occurence: 676 }
   - { x: 0.,     y: 0.,       occurence: 25564 }
   - { x: 5.941,  y: 0.0199,   occurence: 24644 }
   - { x: 5.942,  y: 0.0199,   occurence: 49288 }
   - { x: 5.96,   y: 0.0199,   occurence: 24723 }

）

相应的代码是

dx = np.empty(np.size(x))
dx.fill(0.1)
dy = np.empty(np.size(x)
dy.fill(0.1)

z = np.zeros(np.size(x_gt))

ax1.bar3d(x, y, z, dx, dy, occurence, "red" ) # z is dummy. occurence is height