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area bug(?)

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	area bug(?) by Tom Gettys :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message Some parts of this message have been removed. Learn more about Nabble's security policy. f(x)=dnorm(x,166.3, 26/sqrt(40)) area under path: from: 173.06 to: 1000 area: 0.05 (correct) when I add one more zero to the to: value, the area becomes 0.0826, which is incorrect Tom Gettys 2929 Warren Street Eugene, Oregon 97405 (541) 683-1940 To dream of the person you would like to be is to waste the person you are. ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Graph-support mailing list Graph-support@... https://lists.sourceforge.net/lists/listinfo/graph-support
	Re: area bug(?) by Ivan Johansen :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message Tom Gettys wrote: > f(x)=dnorm(x,166.3, 26/sqrt(40)) > area under path: > from: 173.06 > to: 1000 > area: 0.05 (correct) > > when I add one more zero to the to: value, the area becomes 0.0826, > which is incorrect This is an unfortunately side effect of the algorithm (Simpson's formula) used to calculate the area. When the range gets large rounding errors starts to accumulate. When I find the time I plan to search for a better algorithm. Best regards Ivan Johansen ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Graph-support mailing list Graph-support@... https://lists.sourceforge.net/lists/listinfo/graph-support
	Re: area bug(?) by Tom Gettys :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message No problem - I thought it might be something like that, but wanted to report it in case it was a real bug. Tom Gettys 2929 Warren Street Eugene, Oregon 97405 (541) 683-1940 To dream of the person you would like to be is to waste the person you are. -----Original Message----- From: Ivan Johansen [mailto:graph@...] Sent: Monday, May 18, 2009 3:01 PM To: graph-support@... Subject: Re: [Graph-support] area bug(?) Tom Gettys wrote: > f(x)=dnorm(x,166.3, 26/sqrt(40)) > area under path: > from: 173.06 > to: 1000 > area: 0.05 (correct) > > when I add one more zero to the to: value, the area becomes 0.0826, > which is incorrect This is an unfortunately side effect of the algorithm (Simpson's formula) used to calculate the area. When the range gets large rounding errors starts to accumulate. When I find the time I plan to search for a better algorithm. Best regards Ivan Johansen ---------------------------------------------------------------------------- -- Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Graph-support mailing list Graph-support@... https://lists.sourceforge.net/lists/listinfo/graph-support ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Graph-support mailing list Graph-support@... https://lists.sourceforge.net/lists/listinfo/graph-support