Here is a program that will compute height of points, given relative heights measured at various points as explained in
http://www.network54.com/Forum/13959/message/1195248543
1) All measurements are input from "swap.txt" and converted to whole numbers for accuracy
2) A table of all point names is obtained from the measurement data. Thereafter, points can be known as 1,2,3,etc. rather than string values of the point name.
3) A table is prepared with all known distances between points
4) Missing values are computed.
5) Now we can ask the user for the constant point value and prepare a table of the absolute height of all points.
Mac