RemoveUndefined 指令
来自GeoGebra Manual
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- RemoveUndefined[ <List> ]
- RemoveUndefined[List]
- Removes undefined objects from a list.
- 范例:
RemoveUndefined[Sequence[(-1)^i, i, -3, -1, 0.5]]
removes the second and fourth elements of the sequence since expressions (-1)^{1.5} and (-1)^{2.5} are undefined.