Maintenance script: Automated internal link correction

2016-02-24T23:21:36Z

Automated internal link correction

← Older revision		Revision as of 23:21, 24 February 2016
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	The Real command puts the calculator in real number-only mode. This shouldn't be taken quite literally, as you can still type in ''i'' to get complex numbers, and do operations with them (they will be displayed as in [[TI-BASIC:~~A+bi~~\|A+bi]] mode, in that case). However, any operation done with '''real''' numbers that comes out to a complex result, such as taking the square root of a negative number, will throw a [[TI-BASIC:Errors#nonrealans\|ERR:NONREAL ANS]] error.		The Real command puts the calculator in real number-only mode. This shouldn't be taken quite literally, as you can still type in ''i'' to get complex numbers, and do operations with them (they will be displayed as in [[TI-BASIC:A_Bi\|A+bi]] mode, in that case). However, any operation done with '''real''' numbers that comes out to a complex result, such as taking the square root of a negative number, will throw a [[TI-BASIC:Errors#nonrealans\|ERR:NONREAL ANS]] error.

	There is no real advantage to using Real mode over a+bi mode -- it just adds another error condition that wouldn't be triggered otherwise. However, it is the default setting, and so there's a good chance that the calculator will be in Real mode when someone runs your program. Thus, when using complex numbers implicitly (such as in a quadratic equation solver) you should do something about this.		There is no real advantage to using Real mode over a+bi mode -- it just adds another error condition that wouldn't be triggered otherwise. However, it is the default setting, and so there's a good chance that the calculator will be in Real mode when someone runs your program. Thus, when using complex numbers implicitly (such as in a quadratic equation solver) you should do something about this.
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	= Related Commands =		= Related Commands =

	* [[TI-BASIC:~~A+bi~~\|A+bi]]		* [[TI-BASIC:A_Bi\|A+bi]]
	* [[TI-BASIC:Re_Thetai\|re^θi]]		* [[TI-BASIC:Re_Thetai\|re^θi]]

Maintenance script: Initial automated import

2016-02-24T18:23:22Z

Initial automated import

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{{Template:TI-BASIC:Command
|picture=REAL.GIF
|summary=Enables real number only mode.
|syntax=Real
|location=While editing a program, press:
# MODE to access the mode menu.
# Use arrows and ENTER to select Real.
|compatibility=TI-83/84/+/SE
|size=1 byte
}}

The Real command puts the calculator in real number-only mode. This shouldn't be taken quite literally, as you can still type in ''i'' to get complex numbers, and do operations with them (they will be displayed as in [[TI-BASIC:A+bi|A+bi]] mode, in that case). However, any operation done with '''real''' numbers that comes out to a complex result, such as taking the square root of a negative number, will throw a [[TI-BASIC:Errors#nonrealans|ERR:NONREAL ANS]] error.

There is no real advantage to using Real mode over a+bi mode -- it just adds another error condition that wouldn't be triggered otherwise. However, it is the default setting, and so there's a good chance that the calculator will be in Real mode when someone runs your program. Thus, when using complex numbers implicitly (such as in a quadratic equation solver) you should do something about this.

= Advanced Uses =

Rather than switch to a+bi mode, you might want to force the calculations to use complex numbers by making the original argument complex. The general way to do this is by adding +0i to the number. However, there may be an optimization in any particular case. See the [[TI-BASIC:Quadratic_Formula|Quadratic_Formula]] routine for a good example of this.

Real
Done
√(-1)
(causes an error)
√(-1+0i)
i

= Related Commands =

* [[TI-BASIC:A+bi|A+bi]]
* [[TI-BASIC:Re_Thetai|re^θi]]

= See Also =

* [[TI-BASIC:Quadratic_Formula|Quadratic_Formula]][[Category:TI-BASIC]]
[[Category:TIBD]]

TI-BASIC:Real Mode - Revision history

Maintenance script: Automated internal link correction

Maintenance script: Initial automated import