nan? -- r7rs Definition

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Kind

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predicate;

Implemented by

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• nan? (from vonuvoli);

Procedure signature

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Procedure variants:

• ((number-nan) -> (true))
  • input: a value of type number-nan;
  • output: a value of type true;
• ((number-inf) -> (false))
  • input: a value of type number-inf;
  • output: a value of type false;
• ((number-not-inf-not-nan) -> (false))
  • input: a value of type number-not-inf-not-nan;
  • output: a value of type false;

Exports

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• scheme:inexact -- (scheme inexact);

Exports recursive

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• scheme -- (scheme);

Description

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(nan? z)

The nan? procedure returns #t on +nan.0, and on complex numbers if their real or imaginary parts or both are +nan.0. Otherwise it returns #f.

(nan? +nan.0)          ===>  #t
(nan? 32)              ===>  #f
(nan? +nan.0+5.0i)     ===>  #t
(nan? 1+2i)            ===>  #f

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The text herein was sourced and adapted as described in the "R7RS attribution of various text snippets" appendix.

Referenced-types

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• number-nan;
• true;
• number-inf;
• false;
• number-not-inf-not-nan;