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

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)

Answer 1

[MathWorks Support Team]

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)