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Perl log Function
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 produces the following result −
log10(2): 0.301029995663981 log10(2): 0.477121254719662 log10(2): 0.698970004336019
perl_function_references.htm
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