What is the meaning of 'internal sorting rules' in 'sort' in Symbolic Math Toolbox?
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A = [factorial(sym(1001)), exp(sym(1)) + factorial(sym(1000))]
[r,s] = sort(A)
Obviously, A(1) > A(2). However, the output is
r =
[factorial(1001), exp(1) + factorial(1000)]
s =
1 2
which is quite confusing.
I notice in sort, it is mentioned that
- If X contains symbolic irrational numbers, expressions, and functions, comparing and sorting the elements can be computationally complex. Therefore, sort uses internal sorting rules to optimize its performance.
What is the meaning of 'internal sorting rules' ?
Thank you very much!
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回答(1 个)
David Hill
2022-5-6
A = [factorial(sym(1001)), exp(sym(1)) + factorial(sym(1000))]
[~,s] = sort(vpa(A));%vpa the symbolic before sorting.
A=A(s);%sorted symbolic
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