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Figure 8-15: Non-Linear Optimization
X
O
= +0.020 Y
O
= -0.041
X
S
= +0.348 Y
S
= +0.336
The advantage of the simplex algorithm is that measurements with regular angular
spacing and some elements near the principal north-south and east-west axes are not required.
Nelder-Mead can be applied to MMP field data without manual pre-processing.
You can obtain two programs from McLane that process ACM data using non-linear
Nelder-Mead optimization. The first program must be run under Matlab, the MathWorks.
numerical analysis and computation software package. The second program is a compiled version
of the first that will run under DOS and Windows after an installation routine is run on your PC
(the compiled version can be run without purchasing Matlab). The programs can process both
ACM field data (9 data columns) and spin test data (5 data columns).
During a profile the MMP can experience a number of complete rotations due to depth
and time dependent variations in the direction of flow. The MMP maintains alignment so that the
sting always points into the flow. Compass measurements from these profiles map to all four
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