Question: Inplace element-wise operations in rtables

The map[inplace] operation can apply a function to the elements of an rtable, replacing these elements with the result.  Using map[inplace,evalhf] can be numerically quite efficient but I would like something more general.  For example

x += x +~ v*~dt

where += in some other languages denotes an inplace addition operation and x and v are Vectors (rtable). Is there a way to do this in Maple?

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