Error in loop closure algorithm?

[Olly Betts]

On Wed, Aug 11, 2004 at 11:04:43PM +0100, Mike McCombe wrote:
> Survex moves not only the survey legs in the "bad" loop but also
> adjusts the connecting leg (i.e. test.4 - test.5) and moves the
> station in the "good" loop (i.e. test.4) where the connecting leg
> joins. The "error" is only 1cm which wouldn't show in most cave
> surveys (with me using the instruments!) . However, the error is still
> 1cm if you scale the loops down to, say, 1m per leg - which becomes
> quite noticeable when the loops are small and generally well-closed. 

I'm not seeing this on Linux with Survex 1.0.31.  If I run the second
example through cavern and then 3dtopos, I get these coordinates:

(    0.00,     0.00,     0.00 ) test.1
(   10.00,     0.00,     0.00 ) test.2
(   10.00,   -10.00,     0.00 ) test.3
(    0.00,   -10.00,     0.00 ) test.4
(  -10.00,   -10.00,     0.00 ) test.5
(  -10.00,    -0.42,     0.00 ) test.6
(  -20.00,    -1.50,     0.00 ) test.7
(  -20.00,    -8.92,     0.00 ) test.8

What operating system are you using?  And which version of Survex?

Cheers,
    Olly