## Bug #1292

### BornAgain does not build on mac os x (unittest SpecialFunctionsTest.csinc failure)

Status: | Resolved | Start date: | 02 Feb 2016 | |
---|---|---|---|---|

Priority: | Normal | Due date: | ||

Assignee: | wuttke | % Done: | 0% | |

Category: | - | |||

Target version: | - |

**Description**

Fails SpecialFunctionsTest.csinc unittest during the BornAgain compilation.

The error message:

=======================

[ RUN ] SpecialFunctionsTest.csinc

/Users/ganeva/build/bornagain/BornAgain/Tests/UnitTests/TestCore/SpecialFunctionsTest.h:86: Failure

The difference between (MathFunctions::sinc(z)).real() and (1.-z*z/6.).real() is 3.3306690738754696e-16, which exceeds eps, where

(MathFunctions::sinc(z)).real() evaluates to 0.99999999999999889,

(1.-z*z/6.).real() evaluates to 0.99999999999999856, and

eps evaluates to 2.2999999999999999e-16.

/Users/ganeva/build/bornagain/BornAgain/Tests/UnitTests/TestCore/SpecialFunctionsTest.h:84: Failure

The difference between (MathFunctions::sinc(z)).real() and (1.-z*z/6.).real() is 4.4408920985006262e-16, which exceeds eps, where

(MathFunctions::sinc(z)).real() evaluates to 1.0000000000000357,

(1.-z*z/6.).real() evaluates to 1.0000000000000362, and

eps evaluates to 2.2999999999999999e-16.

/Users/ganeva/build/bornagain/BornAgain/Tests/UnitTests/TestCore/SpecialFunctionsTest.h:90: Failure

The difference between (MathFunctions::sinc(z)).real() and (1.-z*z/6.*(1.-z*z/20.)).real() is 3.3306690738754696e-16, which exceeds eps, where

(MathFunctions::sinc(z)).real() evaluates to 0.99999999999999201,

(1.-z*z/6.*(1.-z*z/20.)).real() evaluates to 0.99999999999999167, and

eps evaluates to 2.2999999999999999e-16.

/Users/ganeva/build/bornagain/BornAgain/Tests/UnitTests/TestCore/SpecialFunctionsTest.h:81: Failure

The difference between (MathFunctions::sinc(z)).real() and (1.-z*z/6.).real() is 3.3306690738754696e-16, which exceeds eps, where

(MathFunctions::sinc(z)).real() evaluates to 0.99999999999999933,

(1.-z*z/6.).real() evaluates to 0.99999999999999967, and

eps evaluates to 2.2999999999999999e-16.

[ FAILED ] SpecialFunctionsTest.csinc (0 ms)

=======================

### History

#### #1 Updated by wuttke about 4 years ago

**Status**changed from*New*to*Resolved***Assignee**set to*wuttke*

hopefully resolved in develop/9320d89bf (eps relaxed to 4.7e-16)