Re: Reals and Equal

*To*: mathgroup at smc.vnet.net*Subject*: [mg62101] Re: Reals and Equal*From*: lucb at ea.com*Date*: Fri, 11 Nov 2005 02:52:13 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

you are really dealing with machine precision numbers here. in the first case, Mathematica said that 0.5000000000000071` was equal to 0.5 and in the second case that 0.5000000000000072` was not equal to 0.5 Due to machine precision comparaison that seems like an ok behavior. If you remove the . in a=1./2 and made it a=1/2 you would see that both test will return false because Mathematica will use the actual exact value. Link to the forum page for this post: http://www.mathematica-users.org/webMathematica/wiki/wiki.jsp?pageName=Special:Forum_ViewTopic&pid=5900#p5900 Posted through http://www.mathematica-users.org [[postId=5900]]