Difference between revisions of "Substitute Command"

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;Substitute[ <expression>, <from>, <to> ]
 
;Substitute[ <expression>, <from>, <to> ]
 
:Substitutes ''from'' in ''expression'' with ''to''.
 
:Substitutes ''from'' in ''expression'' with ''to''.
:{{example| 1=<div><code><nowiki>Substitute[(3 m - 3)^2 - (m + 3)^2, 3 m - 3, a]</nowiki></code> gives ''a<sup>2</sup> - (m + 3)<sup>2</sup>''.</div>}}
+
:{{example| 1=<div><code><nowiki>Substitute[(3 m - 3)^2 - (m + 3)^2, m, a]</nowiki></code> gives ''(3 a - 3)<sup>2</sup> - (a + 3)<sup>2</sup>''.</div>}}
 +
;Substitute[ <Expression>, <Substitution List> ]
 +
:Substitutes in ''expression'' every variable of the list with the variable or number you choose for it.
 +
:{{example| 1=<div><code><nowiki>Substitute[2x+3y-z,{x=a,y=2,z=b}]</nowiki></code> returns ''2a-b+6''.</div>}}

Revision as of 15:02, 10 August 2011


This command works in CAS View only.

Substitute[ <expression>, <from>, <to> ]
Substitutes from in expression with to.
Example:
Substitute[(3 m - 3)^2 - (m + 3)^2, m, a] gives (3 a - 3)2 - (a + 3)2.
Substitute[ <Expression>, <Substitution List> ]
Substitutes in expression every variable of the list with the variable or number you choose for it.
Example:
Substitute[2x+3y-z,{x=a,y=2,z=b}] returns 2a-b+6.
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