System Variable CT - Revision history

Robert Wallick: minor terminology

2015-02-12T05:06:12Z

minor terminology

← Older revision		Revision as of 01:06, 12 February 2015
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	\| Value used by several primitive functions to determine whether two		\| Value used by several primitive functions to determine whether two
	numbers should be considered equal; default for a CLEAR NARS workspace is 3E¯15. }}		numbers should be considered equal; default for a CLEAR NARS workspace is 3E¯15. }}
	{{BoxEnd\|⎕CT←'<i>~~VALUE~~</i>'}}		{{BoxEnd\|⎕CT←<i>RealNumber</i>}}

	Due to computer storage formats, real numbers are normally expressed as n-bits of information<br>		Due to computer storage formats, real numbers(e.g. 1E¯64) are normally expressed as n-bits of information<br>
	and ''not necessarily an exact number''. NARS allows ⎕CT to vary between no larger than 1E¯10 and no smaller than 0.		and ''not necessarily an exact number''. NARS allows ⎕CT to vary between no larger than 1E¯10 and no smaller than 0.<br>
			The IEEE [minimum] standard for floating point real numbers is 64-bits(IEEE-754).

	Examples:		Examples:
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	3E¯15		3E¯15
	</pre>		</pre>
	It is useful to think of ⎕CT as an engineering tolerance +/- for computer science engineers in comparing numbers in APL - sometimes comparing results from '''different computer programs''' or comparing results from '''different methodologies or a standard'''. In Mechanical Engineering, tolerance is defined as the permissible deviation from a specified value of some dimension, often expressed as a percent, e.g. 0.~~0000001~~%.<br>		It is useful to think of ⎕CT as an engineering tolerance +/- for computer science engineers in comparing numbers in APL - sometimes comparing results from '''different computer programs''' or comparing results from '''different methodologies or a standard'''. In Mechanical Engineering, tolerance is defined as the permissible deviation from a specified value of some dimension, often expressed as a percent, e.g. 0.01% and in Nanotechnology, for example, one nanometer is 1E-9 of a meter. <br><br>
			'''See Also: [[System_Variable_FPC\|⎕FPC - Floating Point Control]]'''<br><br>
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Robert Wallick: Set up ⎕CT - Comparison Tolerance

2015-02-12T03:37:42Z

Set up ⎕CT - Comparison Tolerance

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-<h1>{quad}CT - DEFINITION NEEDED</h1>
+<h1>{quad}CT - Comparison Tolerance</h1>
 {{BoxStart|⎕CT
-| DEFINITION NEEDED}}
+| Value used by several primitive functions to determine whether two
 {{BoxEnd|⎕CT←'<i>VALUE</i>'}}
-Description here - to do
+Due to computer storage formats, real numbers are normally expressed as n-bits of information<br>
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Paul Robinson: new stub

2014-11-26T10:15:06Z

new stub

New page

<h1>{quad}CT - DEFINITION NEEDED</h1>
{{BoxStart|⎕CT
| DEFINITION NEEDED}}
{{BoxEnd|⎕CT←'<i>VALUE</i>'}}

Description here - to do

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