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> I am trying to solve a 3D network that has totally 6 points. There are 2 points with known (fixed) XY and 1 point with known Z. There are also 3 other points that are unknown in all XYZ.
> What I want to do is solve the network so that the 2 points with known XY get a solved Z, the point with known Z gets solved XY, and the 3 points with unknown XYZ get solved in XYZ.
> I thought that I have to import the 2 known XY points in "Reference Points 2D" and the one with known Z in "Reference Points 1D". I also imported the other 3 points in "New Points 3D". The observations are directions, Slope distances and Zeniths.
> The software fails to solve the network and I get the message "Singular normal equation matrix. Error, could not invert normal equation matrix.". I suppose there is something wrong with the way I imported the known points, isn't it? If so, what it the right way to import points when some are known and fixed in 2D and some others in 1D?
> By the way, if all points are imported as "Reference points 3D", the network gets solved.

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