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Equal

• To: mathgroup at smc.vnet.net
• Subject: [mg71556] Equal
• From: "dimitris" <dimmechan at yahoo.com>
• Date: Thu, 23 Nov 2006 05:41:26 -0500 (EST)

Dear Andrew,

FrontEndExecute[{HelpBrowserLookup["RefGuide","Equal"]}]

I copy from there

"Approximate numbers are considered equal if they differ in at most
their last eight binary digits (roughly their last two decimal digits).
2 == 2. gives True ".

InputForm[1`2 ]
1.`1.9999999999999998
Precision[%]
2.
 
Use SameQ
 
{3. == 3, 3. === 3}
{True, False}
 
Regards
Dimitris