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Updated for reasons forgotten :-(

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[SVN r39322]
This commit is contained in:
Paul A. Bristow
2007-09-16 15:24:06 +00:00
parent bf7615a38c
commit 07364902cb
1 changed files with 15 additions and 3 deletions
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18
example/error_policy_example.cpp
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@@ -19,7 +19,7 @@
// Boost
#include <boost/math/distributions/students_t.hpp>
using boost::math::students_t_distribution; // Probability of students_t(df, t).
using boost::math::students_t; // Probability of students_t(df, t) convenience typedef.
using boost::math::students_t; // Probability of students_t(df, t) convenience typedef for double.
// std
#include <iostream>
@@ -45,13 +45,25 @@ int main()
{ // Example of error handling of bad argument(s) to a distribution.
cout << "Example error handling using Student's t function. " << endl;
double degrees_of_freedom = -1; double t = -1.; // Bad arguments!
double degrees_of_freedom = -1; double t = -1.; // Two 'bad' arguments!
try
{
cout << "Probability of ignore_error Student's t is " << cdf(my_students_t(degrees_of_freedom), t) << endl;
cout << "Probability of default error policy Student's t is " << endl;
cout << cdf(students_t(-1), -1) << endl;
// BY contrast the students_t distribution default domain error policy is to throw,
cout << cdf(students_t(-1), -1) << endl; // so this will throw.
/*`
Message from thrown exception was:
Error in function boost::math::students_t_distribution<double>::students_t_distribution:
Degrees of freedom argument is -1, but must be > 0 !
*/
// We could also define a 'custom' distribution
// with an "ignore overflow error policy" in a single statement:
using boost::math::policies::overflow_error;
students_t_distribution<double, policy<overflow_error<ignore_error> > > students_t_no_throw(-1);
}
catch(const std::exception& e)
{