Perl log Function

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Description

This function returns the natural logarithm of EXPR, or $_ if omitted. To get the log of another base, use basic algebra: The base-N log of a number is equal to the natural log of that number divided by the natural log of N.

Syntax

Following is the simple syntax for this function:

log EXPR

log

Return Value

This function returns Floating point number in scalar context.

Example

Following is the example code showing its basic usage:

#!/usr/bin/perl -w

print "log10(2): ", log10(2), "\n";
print "log10(2): ", log10(3), "\n";
print "log10(2): ", log10(5), "\n";

sub log10 {
  my $n = shift;
  return log($n)/log(10);
}

When above code is executed, it produced following result

log10(2): 0.301029995663981
log10(2): 0.477121254719662
log10(2): 0.698970004336019


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