ESS_GUIESS_GUI_DocsESS_GUI_batch_fittingESS_GUI_bumps_abstractionESS_GUI_iss1116ESS_GUI_iss879ESS_GUI_iss959ESS_GUI_openclESS_GUI_orderingESS_GUI_sync_sascalccostrafo411magnetic_scattrelease-4.1.1release-4.1.2release-4.2.2release_4.0.1ticket-1009ticket-1094-headlessticket-1242-2d-resolutionticket-1243ticket-1249ticket885unittest-saveload
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Last change
on this file since 479eced was
f2d6445,
checked in by Mathieu Doucet <doucetm@…>, 17 years ago
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moving realSpaceModeling to trunk
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Property mode set to
100644
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File size:
494 bytes
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| [f2d6445] | 1 | #ifndef MATH_UTILS_H |
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| 2 | #define MATH_UTILS_H |
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| 3 | |
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| 4 | /* needed for fabs, sqrt() below */ |
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| 5 | #include <cmath> |
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| 6 | |
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| 7 | |
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| 8 | |
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| 9 | namespace TNT |
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| 10 | { |
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| 11 | /** |
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| 12 | @returns hypotenuse of real (non-complex) scalars a and b by |
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| 13 | avoiding underflow/overflow |
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| 14 | using (a * sqrt( 1 + (b/a) * (b/a))), rather than |
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| 15 | sqrt(a*a + b*b). |
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| 16 | */ |
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| 17 | template <class Real> |
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| 18 | Real hypot(const Real &a, const Real &b) |
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| 19 | { |
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| 20 | |
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| 21 | if (a== 0) |
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| 22 | return abs(b); |
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| 23 | else |
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| 24 | { |
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| 25 | Real c = b/a; |
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| 26 | return fabs(a) * sqrt(1 + c*c); |
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| 27 | } |
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| 28 | } |
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| 29 | } /* TNT namespace */ |
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| 30 | |
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| 31 | |
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| 32 | |
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| 33 | #endif |
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| 34 | /* MATH_UTILS_H */ |
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