LOG2 - NIST
[Pages:2]Mathematical Library Functions
LOG2
LOG2
PURPOSE Compute the base 2 logarithm of a number.
DESCRIPTION The base 2 logarithm is the inverse of the function:
y = 2x That is, given the value of y, the log is the value of the exponent. The input value must be greater than zero.
(EQ 6-97)
Logarithms are a commonly used transformation. The two primary reasons are to symmetrize a skewed data set or to reduce the magnitude of large scale numbers.
SYNTAX LET = LOG2() where is a variable or a parameter containing decimal number(s); is a variable or a parameter (depending on what is) where the computed base 2 logarithms are stored; and where the is optional.
EXAMPLES LET A = LOG2(14) LET X2 = LOG2(X1) LET X2 = LOG2(X1-4)
DEFAULT None
SYNONYMS None
RELATED COMMANDS LOG10 LN LOG
=
Compute the base 10 logarithm of a number.
=
Compute the natural logarithms of a number.
=
Specify logarithmic scales on either the X or Y axis.
APPLICATIONS Data transformation
IMPLEMENTATION DATE Pre-1987
DATAPLOT Reference Manual
March 19, 1997
6-45
LOG2
PROGRAM TITLE AUTOMATIC PLOT LOG2(X) FOR X = .01 .01 9.9
Mathematical Library Functions
PLOT LOG2(X) FOR X = .01 .01 9.9
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
0
1
2
3
4
5
6
7
8
9
10
6-46
August 29, 1996
DATAPLOT Reference Manual
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