Why does the LOG10 function return an error on SYM objects in MATLAB 6.5 (R13)?

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When I run the following code in MATLAB 6.5 (R13) :
x = sym('x')
log10(x)
I get the following error message:
??? Error using ==> log2
Function 'log2' is not defined for values of class 'sym'.
Error in ==> C:\MATLAB6p5\toolbox\matlab\elfun\log10.m
On line 17 ==> y = log2(x);
This code works correctly in MATLAB 6.1 (R12) and returns the following result:
ans =
1125899906842624/2592480341699211*log(x)

Accepted Answer

MathWorks Support Team
MathWorks Support Team on 27 Jun 2009
This bug has been fixed for Release 14 (R14). For previous releases, please read below for any possible workarounds:
This is a bug in the Symbolic Math Toolbox 2.1.3 (R13).
As a workaround, try the following:
x = sym('x')
log(x)./log(10)
This will return:
ans =
1125899906842624/2592480341699211*log(x)

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