Polynomial to the power of polynomial.
1 ビュー (過去 30 日間)
Walter Roberson 2019 年 8 月 26 日
2 is not a root.
There are three ways that an expression A raised to another expression B can be 0.
One way is if A is 0 at a location that B is not also 0. You can solve this by finding the roots of A and cross checking whether they are also roots of B.
A second way is if the A has a value with absolute value strictly less than 1 while B is positive infinity. This cannot occur with pure polynomials: they always go to infinity only at +/- infinity so at any location where B is infinite, A would be as well.
A third way is if A is absolute value strictly greater than 1 and B is negative infinity. This cannot occur in this particular case as B cannot be negative infinity, but it could occur with other polynomial B.
We can see that only the first case applies for these expressions, so find the roots of A as usual. 2 is not one of them.
その他の回答 (1 件)
Jon 2019 年 8 月 26 日
編集済み: Jon 2019 年 8 月 26 日
You should be able to use the MATLAB function fzero for this purpose. You will have call it repeatedly (maybe in a loop) with a different initial starting points to find other roots. I would suggest plotting the function to get some idea of its behavior over the range of x's that you are interested in.
There is a lot of discussion about finding all of the roots (if that is what you need) already in MATLAB answers. I suggest searching through those for some ideas. For example https://www.mathworks.com/matlabcentral/answers/103169-how-do-i-find-all-the-zeros-of-a-function
Note, you should also be clear whether you are just looking for real roots, or complex roots.