Difference between revisions of "Numeric Command"
From GeoGebra Manual
(add cancelation example Numeric[-500000000/785398163*sin(785398163/500000000)*1258025227.19^2+500000000/785398163*1258025227.19^2,30]) |
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:Tries to determine a numerical approximation of the given expression. The number of decimals depends on the global rounding you choose in the [[Options Menu]]. | :Tries to determine a numerical approximation of the given expression. The number of decimals depends on the global rounding you choose in the [[Options Menu]]. | ||
:{{example|1=<div><code><nowiki>Numeric[3 / 2]</nowiki></code> yields ''1.5''.</div>}} | :{{example|1=<div><code><nowiki>Numeric[3 / 2]</nowiki></code> yields ''1.5''.</div>}} | ||
| − | ;Numeric[ <Expression>, < | + | |
| + | |||
| + | ;Numeric[ <Expression>, <Significant Figures> ] | ||
:Tries to determine a numerical approximation of the given expression, using the entered number of significant figures. | :Tries to determine a numerical approximation of the given expression, using the entered number of significant figures. | ||
:{{example|1=<div><code><nowiki>Numeric[sin(1), 20]</nowiki></code> yields ''0.84147098480789650665''.</div>}} | :{{example|1=<div><code><nowiki>Numeric[sin(1), 20]</nowiki></code> yields ''0.84147098480789650665''.</div>}} | ||
| − | :{{note|1=If you don't specify enough digits then you can get an apparently wrong answer due to [http://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html floating point cancelation] for example <br><code>Numeric[-500000000/785398163*sin(785398163/500000000)*1258025227.19^2+500000000/785398163*1258025227.19^2,10]</code> will give 0 but <br><code>Numeric[-500000000/785398163*sin(785398163/500000000)*1258025227.19^2+500000000/785398163*1258025227.19^2,30]</code> will give 0.318309886345536696694580314215}} | + | |
| + | :{{note|1=If you don't specify enough digits then you can get an apparently wrong answer due to [http://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html floating point cancelation] for example <br> <code>Numeric[-500000000/785398163*sin(785398163/500000000)*1258025227.19^2+500000000/785398163*1258025227.19^2,10]</code> will give 0 but <br><code>Numeric[-500000000/785398163*sin(785398163/500000000)*1258025227.19^2+500000000/785398163*1258025227.19^2,30]</code> will give 0.318309886345536696694580314215}} | ||
Revision as of 09:00, 11 July 2013
CAS Syntax
- Numeric[ <Expression> ]
- Tries to determine a numerical approximation of the given expression. The number of decimals depends on the global rounding you choose in the Options Menu.
- Example:
Numeric[3 / 2]yields 1.5.
- Numeric[ <Expression>, <Significant Figures> ]
- Tries to determine a numerical approximation of the given expression, using the entered number of significant figures.
- Example:
Numeric[sin(1), 20]yields 0.84147098480789650665.
- Note: If you don't specify enough digits then you can get an apparently wrong answer due to floating point cancelation for example
Numeric[-500000000/785398163*sin(785398163/500000000)*1258025227.19^2+500000000/785398163*1258025227.19^2,10]will give 0 butNumeric[-500000000/785398163*sin(785398163/500000000)*1258025227.19^2+500000000/785398163*1258025227.19^2,30]will give 0.318309886345536696694580314215
