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<h3 class="section">2.3 Default backend lm_svd_feasible of residual minimization</h3>
<p><a name="index-lm_005fsvd_005ffeasible-36"></a>
Levenberg/Marquardt algorithm using singular value decomposition.
Constraints must be met by the initial parameters and are attempted to
be kept met throughout the optimization.
<p>Returned value <var>cvg</var> will be <code>0</code>, <code>1</code>, or <code>2</code>.
Returned structure <var>outp</var> will have the fields <code>niter</code> and
<code>user_interaction</code>.
<p>Backend-specific defaults are: <code>MaxIter</code>: 20, <code>fract_prec</code>:
<code>zeros (size (parameters))</code>, <code>max_fract_change</code>: <code>Inf</code>
for all parameters. The setting <code>TolX</code> is not honoured.
<p>Interpretation of <code>Display</code>: if set to <code>"iter"</code>, currently
some diagnostics are printed.
<p>Specific option: <code>lm_svd_feasible_alt_s</code>: if falling back to nearly
gradient descent, do it more like original Levenberg/Marquardt method,
with descent in each gradient component; for testing only.
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