Fix Wmaybe-uninitialized in apps/regression/model/trigonometric_model…

[serval2412]

….cpp

Fixes these:
apps/regression/model/trigonometric_model.cpp: In member function ‘virtual void Regression::TrigonometricModel::specializedInitCoefficientsForFit(double*, double, Regression::Store*, int) const’:
apps/regression/model/trigonometric_model.cpp:194:40: warning: ‘xMin’ may be used uninitialized [-Wmaybe-uninitialized]
194 | double period = 2.0 * std::fabs(xMax - xMin);
| ~~~~~^~~~~~
apps/regression/model/trigonometric_model.cpp:187:10: note: ‘xMin’ was declared here
187 | double xMin, xMax, yMin, yMax;
| ^~~~
apps/regression/model/trigonometric_model.cpp:194:40: warning: ‘xMax’ may be used uninitialized [-Wmaybe-uninitialized]
194 | double period = 2.0 * std::fabs(xMax - xMin);
| ~~~~~^~~~~~
apps/regression/model/trigonometric_model.cpp:187:16: note: ‘xMax’ was declared here
187 | double xMin, xMax, yMin, yMax;
| ^~~~
apps/regression/model/trigonometric_model.cpp:190:32: warning: ‘yMin’ may be used uninitialized [-Wmaybe-uninitialized]
190 | modelCoefficients[0] = (yMax - yMin) / 2.0;
| ~~~~~~^~~~~~~
apps/regression/model/trigonometric_model.cpp:187:22: note: ‘yMin’ was declared here
187 | double xMin, xMax, yMin, yMax;
| ^~~~
apps/regression/model/trigonometric_model.cpp:190:32: warning: ‘yMax’ may be used uninitialized [-Wmaybe-uninitialized]
190 | modelCoefficients[0] = (yMax - yMin) / 2.0;
| ~~~~~~^~~~~~~
apps/regression/model/trigonometric_model.cpp:187:28: note: ‘yMax’ was declared here
187 | double xMin, xMax, yMin, yMax;
| ^~~~
LD epsilon.bin

[PiaNumworks]

Thank you for your contribution!
We cherry-picked your changes in our private repository and integrated them for the next version of epsilon.