Deciding zero's to a polynomial function

2 次查看（过去 30 天）
Brian
Brian 2013-6-14
Hi, the question I have to answer is the following: "Decide all the zeros to the function : 0.1x^3 - 5x^2 –x +e^-x = -4, x>0"
I want to know how I can represent this function in matlab? I can't seem to input exp/e. Thanks.
Any help on finding the roots would also be appreciated. Thanks in advance!

请先登录，再回答此问题。

回答（1 个）

Roger Stafford
Roger Stafford 2013-6-14
Use 'fzero' and replace e^-x with exp(-x).
  2 个评论
Brian
Brian 2013-6-14
I'm confused about what to enter, I had this but I'm clearly doing something wrong.
y=[0.1*x.^3 +5*x.^2 -1*x exp(-x)]
fzero(y)
thanks
Brian
Brian 2013-6-15
I still can't get fzero to work :/ thanks for your help so far

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Get Started with MATLAB 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by