Hello Rooters, For fitting purpose I need to use some functions defined per intervall and not defined in others. The function is not defined in some interval (or points), setting the values to 0 (as some suggested) is not an option since it is a other mathematical function. How hard is it to implement this? The constructor could take some TList as argument to define the intervals where the function is defined. When evaluating the function where it is not defined, it can throw an exception. And Minuit could catch it using a try / catch block. This could be also useful for overflow, underflow, division per 0... Is it a goood C++ approach to define such functions? Thanks Matthieu Guillo University of South Carolina Thomas Jefferson National Laboratory Office 71 trailer 16 Phone: 757-269-5551
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