Commit e9435f24 authored by peter@mysql.com's avatar peter@mysql.com
Browse files

Resolve

parent 8ee17f91

Docs/manual.texi

+50 −5
Original line number Diff line number Diff line
@@ -31867,17 +31867,58 @@ mysql> SELECT EXP(2); 
mysql> SELECT EXP(-2);

        -> 0.135335

@end example

@findex LOG()

@item LOG(X)













@findex LN()













@item LN(X)















Returns the natural logarithm of @code{X}:















@example













mysql> SELECT LN(2);













        -> 0.693147













mysql> SELECT LN(-2);













        -> NULL













@end example

























This function was added in MySQL version 4.0.3.













It is synonymous with @code{LOG(X)} in MySQL.

























@findex LOG()













@item LOG([B,]X)













When called with one parameter, this function returns the natural logarithm













of @code{X}:













@example















mysql> SELECT LOG(2);















        -> 0.693147















mysql> SELECT LOG(-2);















        -> NULL















@end example















If you want the log of a number @code{X} to some arbitrary base @code{B}, use













the formula @code{LOG(X)/LOG(B)}.

























When called with two parameters, this function returns the logarithm of













@code{X} for an arbitary base @code{B}:













@example













mysql> SELECT LOG(2,65536);













        -> 16.000000













mysql> SELECT LOG(1,100);













        -> NULL













@end example

























The arbitrary base option was added in MySQL version 4.0.3.













@code{LOG(B,X)} is equivalent to @code{LOG(X)/LOG(B)}.

























@findex LOG2()













@item LOG2(X)













Returns the base-2 logarithm of @code{X}:













@example













mysql> SELECT LOG2(65536);













        -> 16.000000













mysql> SELECT LOG2(-100);













        -> NULL













@end example

























@code{LOG2()} is useful for finding out how many bits a number would













require for storage.













This function was added in MySQL version 4.0.3.













In earlier versions, you can use @code{LOG(X)/LOG(2)} instead.





























@findex LOG10()















@item LOG10(X)










@@ -49694,8 +49735,13 @@ Our TODO section contains what we plan to have in 4.0. @xref{TODO MySQL 4.0}.













@itemize @bullet















@item















Fixed a bug that made the pager option in the mysql client non-functional.













@end itemize













Extended @code{LOG()} function to accept an optional arbitrary base parameter.













@xref{Mathematical functions}.













@item













Added @code{LOG2()} function (useful for finding out how many bits a number would require for storage).















@item













Added @code{LN()} natural logarithm function for compatibility with other databases. It is synonymous with @code{LOG(X)}.













@end itemize















Added OLAP functionality.





























@c Arjen , please add the following text somewhere appropriate in the 









@@ -49704,7 +49750,6 @@ text above:













-------------------------------------------------------------------------





























Documentation for OLAP extension



























Introduction 















------------