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calc: Keypad Functions Menu

 
 16.2 Functions Menu
 ===================
 
      |----+----+----+----+----+----2
      |IGAM|BETA|IBET|ERF |BESJ|BESY|
      |----+----+----+----+----+----|
      |IMAG|CONJ| RE |ATN2|RAND|RAGN|
      |----+----+----+----+----+----|
      |GCD |FACT|DFCT|BNOM|PERM|NXTP|
      |----+----+----+----+----+----|
 
 This menu provides various operations from the ‘f’ and ‘k’ prefix keys.
 
    <IMAG> multiplies the number on the stack by the imaginary number ‘i
 = (0, 1)’.
 
    <RE> extracts the real part a complex number.  ‘INV RE’ extracts the
 imaginary part.
 
    <RAND> takes a number from the top of the stack and computes a random
 number greater than or equal to zero but less than that number.  (
 Random Numbers.)  <RAGN> is the “random again” command; it computes
 another random number using the same limit as last time.
 
    <INV GCD> computes the LCM (least common multiple) function.
 
    <INV FACT> is the gamma function.  ‘gamma(x) = (x-1)!’.
 
    <PERM> is the number-of-permutations function, which is on the ‘H k
 c’ key in normal Calc.
 
    <NXTP> finds the next prime after a number.  ‘INV NXTP’ finds the
 previous prime.
 

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