Why the answer is wrong ?

3 ビュー (過去 30 日間)
m
m 2012 年 12 月 26 日
The answers are 1 and 1 instead -1 and 1, why ?
>> fsolve(@(x) [x.^2-1], ones(2,1))
Equation solved at initial point.
fsolve completed because the vector of function values at the initial point is near zero as measured by the default value of the function tolerance, and the problem appears regular as measured by the gradient.
criteria details
ans =
1
1

サインインしてこの質問に回答する。

回答 (1 件)

Walter Roberson
Walter Roberson 2012 年 12 月 26 日
fsolve() does not look for all possible answers: it just finds candidate answers.
If you were to use (say) [-5, 5] as your initial point, you would be more likely to get -1 and 1 out, but it would not be guaranteed.

カテゴリ

Help Center および File Exchange で Numeric Solvers についてさらに検索

タグ

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by