Infinity: Difference between revisions
Sudleyplace (talk | contribs) (New page: <p>The two infinities are now valid values to be used as numeric limits. The infinity symbol (<apll>∞</apll>) is entered from the keyboard using the key combination '''Alt-f'''. The ot...) |
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<p>The two infinities are now valid values to be used as numeric limits. The infinity symbol (<apll>∞</apll>) is entered from the keyboard using the key combination '''Alt-f'''. The other infinity is obtained from the positive form by preceding it with a negative symbol (<apll>¯∞</apll>). The underbar symbol (<apll>_</apll>) is an alias for the infinity symbol on entry; however, when displaying | <p>The two infinities are now valid values to be used as the upper and lower numeric limits. The infinity symbol (<apll>∞</apll>) is entered from the keyboard using the key combination '''Alt-f'''. The other infinity is obtained from the positive form by preceding it with a negative symbol (<apll>¯∞</apll>). The underbar symbol (<apll>_</apll>) is an alias for the infinity symbol on entry; however, when displaying a variable that contains an infinity, <apll>∞</apll> is used.</p> | ||
<p>For example,</p> | <p>For example,</p> | ||
| <apll> ⌊/⍬<br /> | ||
∞</apll><br /> | ∞</apll><br /><br /> | ||
| <apll> ⌈/⍬<br /> | ||
¯∞</apll><br /> | ¯∞</apll><br /><br /> | ||
| <apll> 9*999<br /> | ||
∞</apll><br /> | ∞</apll><br /><br /> | ||
| <apll> ÷0<br /> | ||
∞</apll><br /> | ∞</apll><br /><br /> | ||
| <apll> ÷¯∞ ∞<br /> | ||
0 0</apll><br /> | 0 0</apll><br /><br /> | ||
| <apll> ¯_ _ ¯∞ ∞<br /> | ||
¯∞ ∞ ¯∞ ∞</apll><br /> | ¯∞ ∞ ¯∞ ∞</apll><br /><br /> | ||
<apll> ¯∞ 0 ∞∘.<¯∞ 0 ∞<br /> | |||
0 1 1<br /> | |||
0 0 1<br /> | |||
0 0 0</apll><br /> | |||
<br /> | |||
<p>There are many cases that need to be examined to see how infinity should behave; this work has yet to be done, so you might notice some anomalous results using infinity.</p> | <p>There are many cases that need to be examined to see how infinity should behave; this work has yet to be done, so you might notice some anomalous results using infinity.</p> | ||
<p>Also, see the description of the system variable [[System Variable IC|<apll>⎕IC</apll>]] (Indeterminate Control) for a way to control how infinity along with other indeterminates are handled. | <p>Also, see the description of the system variable [[System Variable IC|<apll>⎕IC</apll>]] (Indeterminate Control) for a way to control how infinity along with other indeterminates are handled. | ||
Revision as of 18:07, 7 May 2008
The two infinities are now valid values to be used as the upper and lower numeric limits. The infinity symbol (∞) is entered from the keyboard using the key combination Alt-f. The other infinity is obtained from the positive form by preceding it with a negative symbol (¯∞). The underbar symbol (_) is an alias for the infinity symbol on entry; however, when displaying a variable that contains an infinity, ∞ is used.
For example,
⌊/⍬
∞
⌈/⍬
¯∞
9*999
∞
÷0
∞
÷¯∞ ∞
0 0
¯_ _ ¯∞ ∞
¯∞ ∞ ¯∞ ∞
¯∞ 0 ∞∘.<¯∞ 0 ∞
0 1 1
0 0 1
0 0 0
There are many cases that need to be examined to see how infinity should behave; this work has yet to be done, so you might notice some anomalous results using infinity.
Also, see the description of the system variable ⎕IC (Indeterminate Control) for a way to control how infinity along with other indeterminates are handled.
