Difference between revisions of "If Command"
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; If[Condition, Object]: Yields a copy of the object if the condition evaluates to ''true'', and an undefined object if it evaluates to ''false''. | ; If[Condition, Object]: Yields a copy of the object if the condition evaluates to ''true'', and an undefined object if it evaluates to ''false''. | ||
; If[Condition, Object a, Object b]: Yields a copy of object ''a'' if the condition evaluates to ''true'', and a copy of object ''b'' if it evaluates to ''false''. | ; If[Condition, Object a, Object b]: Yields a copy of object ''a'' if the condition evaluates to ''true'', and a copy of object ''b'' if it evaluates to ''false''. | ||
| − | + | {{warning|Both objects must be of the same type.}} | |
| − | + | ===Conditional Functions=== | |
| − | * Example: <tt>f(x) = If[x < 3, sin(x), x^2]</tt> yields a function that equals ''sin(x)'' for ''x < 3'' and ''x<sup>2</sup>'' for ''x ≥ 3'' | + | The ''If'' command can be used to create conditional functions. Such conditional functions may be used as arguments in any command that takes a function argument, such as [[Derivative Command|Derivative]], [[Integral Command|Integral]], and [[Intersect Command|Intersect]]. |
| − | + | ||
| − | + | * Example: <tt>f(x) = If[x < 3, sin(x), x^2]</tt> yields a function that equals ''sin(x)'' for ''x < 3'' and ''x<sup>2</sup>'' for ''x ≥ 3'' | |
| + | {{note|See the section [[Boolean values]] for the symbols used in conditional statements.^^ | ||
Revision as of 00:31, 4 February 2011
- If[Condition, Object]
- Yields a copy of the object if the condition evaluates to true, and an undefined object if it evaluates to false.
- If[Condition, Object a, Object b]
- Yields a copy of object a if the condition evaluates to true, and a copy of object b if it evaluates to false.
 Warning: | Both objects must be of the same type. |
Conditional Functions
The If command can be used to create conditional functions. Such conditional functions may be used as arguments in any command that takes a function argument, such as Derivative, Integral, and Intersect.
- Example: f(x) = If[x < 3, sin(x), x^2] yields a function that equals sin(x) for x < 3 and x2 for x ≥ 3
{{note|See the section Boolean values for the symbols used in conditional statements.^^
