Returns the graph window with the given index. Note that the index is not necessarily the same as the ID. If there are 3 graphs open, their indices will be 0, 1 and 2. However their IDs will depend on how many other graphs have been created and subsequently closed - e.g. they may have IDs 1, 3 and 6 if graphs 2, 4 and 5 have been deleted.
| i | integer | index of the desired graph (0..countGraphs()-1) |
| Return value | IFGraph |
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