User Manual

Chapter 2: Math, Angle, and Test Operations 58
Factorial
! (factorial) returns the factorial of either an integer or a multiple of .5. For a list, it returns factorials
for each integer or multiple of .5.
value must be ‚ L.5 and  69.
value!
Note: The factorial is computed recursively using the relationship (n+1)! = n…n!, until n is reduced
to either 0 or
L1/2. At that point, the definition 0!=1 or the definition (L1à2)!=‡p is used to complete
the calculation. Hence:
n!=n…(nN1)…(nN2)… ... …2…1, if n is an integer ‚ 0
n!= n…(nN1)…(nN2)… ... …1à2…‡p, if n+1à2 is an integer ‚ 0
n! is an error, if neither n nor n+1à2 is an integer ‚ 0.
(The variable n equals
value in the syntax description above.)
randInt(
randInt( (random integer) generates and displays a random integer within a range specified by
lower and upper integer bounds. To generate a list of random numbers, specify an integer > 1 for
numtrials (number of trials); if not specified, the default is 1.
randInt(lower,upper[,numtrials])
randNorm(
randNorm( (random Normal) generates and displays a random real number from a specified
Normal distribution. Each generated value could be any real number, but most will be within the
interval [mN3(s), m+3(s)]. To generate a list of random numbers, specify an integer > 1 for
numtrials
(number of trials); if not specified, the default is 1.
randNorm(m,s[,numtrials])