Bug in matlab's builtin sort routine

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Leo Simon
Leo Simon 2013-1-25
Matlab's 2012b has introduced all sorts of bugs in its sort routine. Consider the following
syms d1_X1_f1 d1_X1_f2 d1_X2_f1 d1_X2_f2 d1_b1_f1 real
A = sort([d1_X1_f1, d1_X1_f2, d1_X2_f1, d1_X2_f2, d1_b1_f1 ])
A'
In R2011a, this is correctly sorted as
d1_X1_f1
d1_X1_f2
d1_X2_f1
d1_X2_f2
d1_b1_f1
But in R2012b, we get
d1_X1_f1
d1_X1_f2
d1_X2_f1
d1_b1_f1
d1_X2_f2
There is at least one other bug that I've discovered, which I've been able to work around, but this one is really nasty. Does anybody have out there a sort algorithm that works properly? Since sort is a builtin, I can't just pull in the file from my 2011a distribution.
Any advice would be appreciated!
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Leo Simon
Leo Simon 2013-1-25
I did report this, and a related one due to symbolic sorting. Hopefully they'll do something about it.
Andreas Goser
Andreas Goser 2013-1-25
Hope is not a strategy ;-) I researched and the bugs are fixed. I will contact you by email for additional information.

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回答（2 个）

Walter Roberson
Walter Roberson 2013-1-25
If you use
T = [d1_X1_f1, d1_X1_f2, d1_X2_f1, d1_X2_f2, d1_b1_f1 ];
which sort(T)
I suspect you will find that a symbolic toolbox sort.m is used (but that file might call into MuPAD)
Leo Simon
Leo Simon 2013-1-25
I guess I've found my own workaround, which is incredibly unsatisfactory, but does seem to work. Convert the symbolic array to a cell array of strings, then sort, then convert back to syms. Uggh, I feel ill just typing this....
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Andreas Goser
Andreas Goser 2013-1-28
Worked with the customer offline. If another customer runs into this and calls Technical Support, refer to "G906530"

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