Infinity: Difference between revisions
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<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>) | <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>).</p> | ||
<p>For example,</p> | <p>For example,</p> | ||
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<apll> ÷¯∞ ∞<br /> | <apll> ÷¯∞ ∞<br /> | ||
0 0</apll><br /><br /> | 0 0</apll><br /><br /> | ||
<apll> | <apll> ('<',a),a⍪a∘.<a←¯∞ 0 ∞<br /> | ||
¯∞ ∞ | < ¯∞ 0 ∞<br /> | ||
¯∞ 0 1 1<br /> | |||
| 0 0 0 1<br /> | ||
| ∞ 0 0 0</apll><br /> | ||
0 0 0</apll><br /> | |||
<br /> | <br /> | ||
Revision as of 12:15, 18 August 2011
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 (¯∞).
For example,
⌊/⍬
∞
⌈/⍬
¯∞
9*999
∞
÷0
∞
÷¯∞ ∞
0 0
('<',a),a⍪a∘.<a←¯∞ 0 ∞
< ¯∞ 0 ∞
¯∞ 0 1 1
0 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.
