Infinity: Difference between revisions

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<p>For example,</p>
<p>For example,</p>


<apll>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;⌊/⍬<br />
<apll><pre>
∞</apll><br /><br />
      ⌊/⍬
<apll>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;⌈/⍬<br />
∞
¯∞</apll><br /><br />
      ⌈/⍬
<apll>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9*999<br />
¯∞
∞</apll><br /><br />
      9*999
<apll>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;÷0<br />
∞
∞</apll><br /><br />
      ÷0
<apll>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;÷¯∞ ∞<br />
∞
0 0</apll><br /><br />
      ÷¯∞ ∞
<apll>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;('&lt;',a),a⍪a∘.&lt;a←¯∞ 0 ∞<br />
0 0
&nbsp;&nbsp;&lt; ¯∞ 0 ∞<br />
      ('&lt;',a),a⍪a∘.&lt;a←¯∞ 0 ∞
&nbsp;¯∞&nbsp;&nbsp;0 1 1<br />
  &lt; ¯∞ 0 ∞
&nbsp;&nbsp;0&nbsp;&nbsp;0 0 1<br />
¯∞ 0 1 1
&nbsp;&nbsp;∞&nbsp;&nbsp;0 0 0</apll><br />
  0 0 0 1
<br />
  ∞ 0 0 0
</pre></apll>


<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.
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Latest revision as of 19:15, 15 April 2018

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

Also, see the description of the system variable ⎕IC (Indeterminate Control) for a way to control how infinity along with other indeterminates are handled.

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