【求助】急急急！各位大哥帮忙看看 - MATLAB爱好者论坛-LabFans.com

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...rtW/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

2007-07-03, 07:44	#1
zhihaikou 初级会员注册日期: 2007-07-03 帖子: 3 声望力: 0	*【求助】xexp(x)=2 这个方程怎么解？** [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

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2007-07-03, 09:29	#2
slgu 高级会员注册日期: 2007-06-24 年龄: 70 帖子: 188 声望力: 21	solve('x*exp(x)-2') ans = lambertw(2) >> lambertw(2) ans = 0.8526

2007-07-03, 15:45	#3
zhihaikou 初级会员注册日期: 2007-07-03 帖子: 3 声望力: 0	非常谢谢兄弟

2007-07-03, 15:46	#4
zhihaikou 初级会员注册日期: 2007-07-03 帖子: 3 声望力: 0	lambertw 是什么意思？

2007-07-04, 08:12	#5
slgu 高级会员注册日期: 2007-06-24 年龄: 70 帖子: 188 声望力: 21	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...rtW/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