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LSST Data Management Base Package
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param_defs.cc
Go to the documentation of this file.
2
4
5namespace lsst::gauss2d::fit {
6double finite_difference_param(ParamBase& param, double delta) {
7 const double value = param.get_value_transformed();
8 double value_new = value + delta;
9 try {
10 param.set_value_transformed(value_new);
11 // If the param is near an upper limit, this might fail: try -delta then
12 if (param.get_value_transformed() != value_new) {
13 delta = -delta;
14 value_new = value + delta;
15 param.set_value_transformed(value_new);
16 }
17 } catch (const std::runtime_error& err) {
18 delta = -delta;
19 value_new = value + delta;
20 try {
21 param.set_value_transformed(value_new);
22 } catch (const std::runtime_error& err2) {
23 throw std::runtime_error("Couldn't set param=" + param.str()
24 + " to new value_transformed=" + std::to_string(value_new) + " due to "
25 + err2.what() + "; are limits too restrictive?");
26 }
27 }
28 return delta;
29}
30} // namespace lsst::gauss2d::fit
virtual std::string str() const =0
Return a brief, human-readable string representation of this.
virtual void set_value_transformed(T value_transformed)=0
Set the transformed value for this parameter instance.
virtual T get_value_transformed() const =0
Return the transformed value of this parameter instance.
double finite_difference_param(ParamBase &param, double delta)
Definition param_defs.cc:6
lsst::modelfit::parameters::ParameterBase< double > ParamBase
Definition param_defs.h:9
T to_string(T... args)
T what(T... args)