Mercurial > dive4elements > river
diff flys-artifacts/src/main/java/de/intevation/flys/exports/fixings/FixATWriter.java @ 3643:171db4d5d3cb
FixA: AT export: prevent some numerical problems with steep functions around zero.
flys-artifacts/trunk@5363 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Wed, 05 Sep 2012 08:38:12 +0000 |
| parents | 83c0735092a3 |
| children | 8bbb9e173297 |
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--- a/flys-artifacts/src/main/java/de/intevation/flys/exports/fixings/FixATWriter.java Wed Sep 05 08:23:56 2012 +0000 +++ b/flys-artifacts/src/main/java/de/intevation/flys/exports/fixings/FixATWriter.java Wed Sep 05 08:38:12 2012 +0000 @@ -32,6 +32,7 @@ private static final int MAX_ITERATIONS = 10000; private static final double EPSILON = 1e-8; + private static final double MIN_Q = 1e-4; protected Function function; protected Parameters parameters; @@ -166,7 +167,7 @@ double w = lastW - stepWidth; double q = function.value(w); - if (Double.isNaN(q) || q > lastQ || q < 0d) { + if (Double.isNaN(q) || q > lastQ || q < MIN_Q) { if (stepWidth < EPSILON) { break; }