MatPlot Studio
After MatPlot Detective and MatPlot 3D Detective. This set is the figure window: zoom, save, print, menu options, subplot spacing, 3D rotate/scale, then the sliding-box beam.
改几乎写好的代码，再改一版，最后从核心自己画。 Open the Data tab — those arrays are loaded on Run.
This sandbox is Agg (no GUI). Map the window to code:
| Window | Code |
|---|---|
| Zoom in / out | xlim / ylim |
| File → Save | savefig (png, pdf, svg, eps) |
| File → Print | savefig (pdf, ps) |
| Grid / legend / layout | grid, legend, tight_layout |
| More space between plots | subplots_adjust(hspace=..., wspace=...) |
| Rotate / scale a surface | view_init(elev, azim), set_box_aspect / set_zlim |
Beam (Landau-style): length L = 10 m, weight W = 400 N, supports d = 2 m apart, box Wb = 800 N starts above the left support and slides right at v = 7 m/s.
- Put left support A at 0, right support B at d. Vertical force balance plus torque about A.
- Three supports: add C at L. Teaching model — the box is carried only by the two supports of the span it is on (lever rule). Split the beam weight at B: 80 N on AB (40 N each end) and 320 N on BC (160 N each end).