08-04-2009
taking the Log2 values
Hi,
I am able to take the log value for the third column of a file using the script below. But I want to take the log2 (not the log). How would I write that?
thanks
awk 'BEGIN {OFS="\t"} {print $1, $2, log ($3)}'
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LEARN ABOUT OPENDARWIN
log1p
LOG(3) BSD Library Functions Manual LOG(3)
NAME
log, log2, log10, log1p, -- logarithm functions
SYNOPSIS
#include <math.h>
double
log(double x);
double
log2(double x);
double
log10(double x);
double
log1p(double x);
DESCRIPTION
The log() function computes the value of the natural logarithm of argument x.
The log2() function computes the value of the logarithm of argument x to base 2.
The log10() function computes the value of the logarithm of argument x to base 10.
The log1p() function computes the value of log(1+x) accurately even for very small values of x.
SPECIAL VALUES
log(+-0) , log2(+-0) , and log10(+-0) return -infinity and raise the "divide-by-zero" floating-point exception.
log(1) , log2(1) , and log10(1) return +0.
log(x) , log2(x) , and log10(x) return a NaN and raise the "invalid" floating-point exception for x < 0.
log(+infinity) , log2(+infinity) , and log10(+infinity) return +infinity.
log1p(+-0) returns +-0.
log1p(-1) returns -infinity and raises the "divide-by-zero" floating-point exception.
log1p(x) returns a NaN and raises the "invalid" floating-point exception for x < -1.
log1p(+infinity) returns +infinity.
SEE ALSO
math(3), exp(3), exp2(3), expm1(3), pow(3), infnan(3)
STANDARDS
The log() , log2() , log10() , and log1p() functions conform to ISO/IEC 9899:1999(E).
4th Berkeley Distribution July 2, 2003 4th Berkeley Distribution