Home · A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z · Numbers & Symbols

The Compleat User RPL Encyclopedia


(“Unknown”)

  '?'

HP49/50 only

Keyboard Access: ALPHA-RS-3

“Undefined” constant function. Also known as “Not a Number” or “NaN”.

is a constant which means “not a number” or “undefined”. This is different from “infinity” which means “growing without bound”. The IEEE symbol for is NaN. The HP49/50 yields whenever the result of an exact calculation is not mathematically determinable, e.g. 0/0 in exact mode. is a kind of mathematical black hole; when used as an input to any calculation, the result should always be .

Examples (Exact Mode only!):

1 0 /     (infinity)
0 0 /     (undefined)
0 0 ^    
      
      
      (the mantissa of infinity is unknown)
      (the exponent of infinity is infinite)
See also: .

BYTES:
: 5.5
: 10.5

XLIB 788 137