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IID

This constant controls the amount of diagnostic output printed in fort.9 : the greater IID the more detailed the diagnostic output.
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IID=0 : Minimal diagnostic output. This setting is not recommended.
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IID=2 : Regular diagnostic output. This is the recommended value of IID.
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IID=3 : This setting gives additional diagnostic output for algebraic equations, namely the Jacobian and the residual vector at the starting point. This information, which is printed at the beginning of fort.9, is useful for verifying whether the starting solution in STPNT is indeed a solution.
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IID=4 : This setting gives additional diagnostic output for differential equations, namely the reduced system and the associated residual vector. This information is printed for every step and for every Newton iteration, and should normally be suppressed. In particular it can be used to verify whether the starting solution is indeed a solution. For this purpose, the stepsize DS should be small, and one should look at the residuals printed in the fort.9 output-file. (Note that the first residual vector printed in fort.9 may be identically zero, as it may correspond to the computation of the starting direction. Look at the second residual vector in such case.) This residual vector has dimension NDIM+NBC+NINT+1, which accounts for the NDIM differential equations, the NBC boundary conditions, the NINT user-defined integral constraints, and the pseudo-arclength equation. For proper interpretations of these data one may want to refer to the solution algorithm for solving the collocation system, as described in DoKeKe:91b DoKeKe:91b.
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IID=5 : This setting gives very extensive diagnostic output for differential equations, namely, debug output from the linear equation solver. This setting should not normally be used as it may result in a huge fort.9 file.


next up previous contents
Next: IPLT Up: Output Control. Previous: NPR   Contents
Gabriel Lord 2007-11-19