Matlab says that the 'e' is undefined

13 次查看（过去 30 天）
Sarah Park
Sarah Park 2017-7-26
评论： Sarah Park 2017-7-26
Hi,
I trying to get an integral of a simple function F(x) = 3*x.^2 + e.^(2*x) and matlab won't let me enter the equation, so I am stuck with figuring out how to enter in the function F(x) into the system.
The question I am struggling on is, "compute the integral of the function F(x) using symbolic manipulation functionality", and I have no clue where to start on..
Please help me start off! Much appreciated if you guys could provide me with some commands as well.
Thank you!

请先登录，再回答此问题。

回答（2 个）

Guillaume
Guillaume 2017-7-26
In matlab, and many languages, the exponential function is exp, not e.
F(x) = 3*x.^2 + exp(2*x)
  4 个评论
显示 2更早的评论
Sarah Park
Sarah Park 2017-7-26
编辑：Stephen23 2017-7-26
@stephen Cobeldick: Thank you for your answer! I just cleared everything in my workspace and entered the original x values
x1=cos(pi/6);
x2=cos(3*pi/6);
x3=cos(5*pi/6);
but now it says: "undefined function or variable 'x'". I don't know what to do..
Stephen23
Stephen23 2017-7-26
编辑：Stephen23 2017-7-26
@Sarah Park: you show that you defined three variables named x1, x2, and x3, but apparently you do not define any variable named x.
"I don't know what to do.."
You need to define a variable before you can use in in any calculation or operation.

请先登录，再进行评论。

Torsten
Torsten 2017-7-26
See the examples under
https://de.mathworks.com/help/symbolic/int.html
Best wishes
Torsten.

类别

在 Help Center 和 File Exchange 中查找有关 Loops and Conditional Statements 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