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查看完整版本 : 【求助】急 急 急！ 各位大哥帮忙看看

zhihaikou
2007-07-03, 07:44
[求助]急 急 急！ 各位大哥帮忙看看

x*exp(x)=2

这个方程怎么解？？


如果用matlab怎么解？？？
谢谢了
slgu
2007-07-03, 09:29
solve('x*exp(x)-2')
ans =
lambertw(2)
>> lambertw(2)
ans =
0.8526
zhihaikou
2007-07-03, 15:45
非常谢谢
兄弟
zhihaikou
2007-07-03, 15:46
lambertw
是什么意思？
slgu
2007-07-04, 08:12
LAMBERTW Lambert's W function.
W = LAMBERTW(X) is the solution to w*exp(w) = x.
W = LAMBERTW(K,X) is the K-th branch of this multi-valued function.
Reference: Robert M. Corless, G. H. Gonnet, D. E. G. Hare,
D. J. Jeffrey, and D. E. Knuth, "On the Lambert W Function",
Advances in Computational Mathematics, volume 5, 1996, pp. 329-359.
Also available from:
http://pineapple.apmaths.uwo.ca/~rmc/papers/LambertW/index.html

Overloaded functions or methods (ones with the same name in other directories)
help sym/lambertw.m

Reference page in Help browser
doc lambertw