Linked Questions
145 questions linked to/from How do I work with Root objects?
11
votes
2
answers
3k
views
Expressing the n-th power of a matrix [duplicate]
My matrix is
$\qquad A= \begin{pmatrix}
{1} & {2} & {3}\\
{4} & {1} & {0}\\
{0} & {5} & {4}
\end{pmatrix} $
I need
$\qquad A^n$
I tried
...
- 417
3
votes
1
answer
2k
views
4
votes
1
answer
6k
views
What do the hashtags represent in the result of Solve, and how should I use them? [duplicate]
There is a function that I'm trying to get the inverse of. My function is a simple polynomial:
Tn[T_] := 4/9 T^3/Tc^2 + 5/9 T
Now I tried to find ...
- 215
0
votes
2
answers
2k
views
How to exract the roots from "Roots"? [duplicate]
Given how the output looks like, as in a set of "==" assignments, is it possible to extract specific roots from the output of, http://reference.wolfram.com/language/ref/Roots.html ?
And then do a ...
- 1,191
0
votes
1
answer
3k
views
what do those signs #1, #1^2, #1^3, & mean here? [duplicate]
I have read common pitfalls page and the documentation page but I still don't understand what do those signs mean here?
...
- 967
0
votes
2
answers
1k
views
Why does my Solve output contain this symbol? [duplicate]
I have a pair of coupled polynomial equations that I need to solve, so I tried using Mathematica's solve tool. This is the code that I wrote:
...
- 1
0
votes
3
answers
655
views
Problems with finding the real solutions of equation [duplicate]
I am trying to find real solutions of equation using Mathematica 8.0 but there is some problem I don't know how to explain.
For example, for the input
...
- 5
0
votes
1
answer
584
views
Understanding Root and Solving higher degree polynomials [duplicate]
I have trouble understanding Root in Mathematica.
For instance:
Solve[x^5 + 2 x + 1 == 0, x]
gives me a strange solution ...
- 3,103
1
vote
2
answers
519
views
Roots of an equation output [duplicate]
I'm trying get the critical points of the function $f(x)=(( 1 - 3*(x + 1)^3)/(x^4 + 1))*(x - 2)$ so I took the derivative which is $(16 + 18 x - 9 x^2 - 28 x^3 - 48 x^4 - 18 x^5 + 3 x^6)/(1 + x^4)^2$ ...
- 11
1
vote
1
answer
338
views
Mathematica not giving exact answer for Solve [duplicate]
I'm trying to find the maximum value of
d[x_]:=4-(1/5)x^2-3*Cos[Pi*x/6]
For -5 < x < 5. Aside from x=0 which is a local minimum, when I use Solve, I can ...
- 31
3
votes
1
answer
212
views
Help me with understanding root objects [duplicate]
I solved an polynomial equation of degree 20 and got root objects as solutions. I cannot understand how to match such output to any standard analytic form. After studying ...
0
votes
1
answer
402
views
Eigenvalues for a $ 4 \times 4 $ matrix [duplicate]
In Mathematica, I computed the following:
...
- 39
0
votes
0
answers
566
views
How do I interpret the Roots syntax when I am finding the eigenvalues of a matrix [duplicate]
Here is an example of my problem:
I am somewhat confused by the syntax of this. I am guessing that the #1 is specifying the start of another root? Why then does one of the roots = u + with nothing ...
- 101
2
votes
1
answer
240
views
MatrixExp[] for 4 by 4 matrix gives an unavailable answer [duplicate]
Q = ( {
{-7, 1, 2, 4},
{2, -4, 1, 1},
{2, 2, -6, 2},
{1, 1, 1, -3}
} )
MatrixExp[Q*t]
I defined the matrix Q and executed the command. Then I ...
- 23
0
votes
1
answer
302
views
How to get rid of # in answer (eigensystem)? [duplicate]
I was trying to find the eigensystem of the following matrix (act as if the second character is in subscript):
\begin{pmatrix}
0 & 0 & 1 & 0 \\
0 & 0 & 0 & 1 \\
\frac{-\...
- 103