Write a script that calculates the user produced polynomial. The polynomial can be input until the user decides to terminate the program.

Question

Ivan Roko Cavka 2020-1-29

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/502631-write-a-script-that-calculates-the-user-produced-polynomial-the-polynomial-can-be-input-until-the

编辑： Matt J 2020-1-29

Hello,

I've been given an asignment in school and I'm a bit stuck with this task in the title.

Can anyone help me write the script because I don't know how to create a polynomial that is user decided and loop it at the same time?

Thanks in adwance.

2 个评论
显示无隐藏无

Matt J 2020-1-29

编辑：Matt J 2020-1-29

在 MATLAB Online 中打开

Once you've written something, we can help fix things. As a hint, the following would be one way to read in a vector of polynomial coefficients, e.g,

>> p = input('\nEnter polynomial coefficients: ')
Enter polynomial coefficients: [1,2,1]
p =
     1     2     1

Ivan Roko Cavka 2020-1-29

Thanks for the tip Matt, but I don't understand how can I make an indipendant equasion based on the users input. For e.g.

p = input('\nEnter polynomial coefficients: ')

x = input ('\nEnter the x coefficient; ')

y = p*x

If I type it like this, the x multiplies each of the matrix components, but I want the input to be read as a polynomial like e.g. x^3 + x^2 - 1 , or any other variation based on the users input. And I guess I should be using a while loop with all this done?

I only know a way to do it if I know how many charachters will the user put in, and it's not very efficient.

Hope you'll help me get this thing done, cuz it's driving me crazy ;)

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Matt J 2020-1-29

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/502631-write-a-script-that-calculates-the-user-produced-polynomial-the-polynomial-can-be-input-until-the#answer_412709

编辑：Matt J 2020-1-29

在 MATLAB Online 中打开

If you have the Symbolic Math Toolbox and wish to manipulate the polynomials in symbolic form, you can use poly2sym,

>> p = input('\nEnter polynomial coefficients: ')
Enter polynomial coefficients: [1,1,0,-1]
p =
     1     1     0    -1
>> P=poly2sym(p)
 
P =
 
x^3 + x^2 - 1
 

However, that's often unnecessary. There are many Matlab commands that can analyze polynomials given only a vector representing their coefficients, e.g.,

>> roots(p)  %roots of the polynomial
ans =
  -0.8774 + 0.7449i
  -0.8774 - 0.7449i
   0.7549 + 0.0000i

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Write a script that calculates the user produced polynomial. The polynomial can be input until the user decides to terminate the program.

2 个评论
显示无隐藏无

采纳的回答

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

更多回答（0 个）

另请参阅

类别

标签

Community Treasure Hunt

Write a script that calculates the ​​user produced polynomial. The polynomial can be input until the user decides to terminate the program.

2 个评论 显示 无隐藏 无

采纳的回答

0 个评论 显示 -2更早的评论隐藏 -2更早的评论

更多回答（0 个）

另请参阅

类别

标签

Community Treasure Hunt

Write a script that calculates the user produced polynomial. The polynomial can be input until the user decides to terminate the program.

2 个评论
显示无隐藏无

0 个评论
显示 -2更早的评论隐藏 -2更早的评论