[Rd] strheight() crashes without opened device (PR#524)

[Thomas Lumley]

On Tue, 18 Apr 2000 ligges@statistik.uni-dortmund.de wrote:

> My mistake, but also a bug.
> I did not open a device and called strheight("X").
> ==> R crashed

Fixed for R1.1: we weren't checking that the device existed.

	-thomas


Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle

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