2010/6/5 463575346 <[email protected]>:
> i hope my dear teacher can add a function "back a step"in the gmsh program

Indeed, that would be nice.

Meanwhile, one can recover from most missteps by editing the .geo file
in which Gmsh records almost all the graphical interactions; it's
called "untitled.geo" unless you start gmsh reading something else.

Most created entities can be deleted too, though that leaves an
unsightly record in the .geo file.

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