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发表于 2009-9-11 14:41:03
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来自 北京
帮助里写的很明白,其他人结果不一样,是使用的什么版本
在什么情况下,得出的不同结果?
diff
Differentiate symbolic expression
Syntax
diff(S)
diff(S,'v')
diff(S,n)
diff(S,'v',n)
Description
diff(S) differentiates a symbolic expression S with respect to its free variable as determined by symvar.
diff(S,'v') or diff(S,sym('v')) differentiates S with respect to v.
diff(S,n), for a positive integer n, differentiates S n times.
diff(S,'v',n) and diff(S,n,'v') are also acceptable. |
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