Linked Questions

1 vote
0 answers
168 views

Finding Maximum Root [duplicate]

How can I find the greatest root for a polynomial if the polynomial degree is very large. One way is using NSolve. This command can find all roots in numeric. Then, ...
MATIRMAK's user avatar
  • 739
4 votes
2 answers
4k views

Can mathematica solve this equation?

I have the following Mathematica code to solve an equation coming from isoparameteric finite element for quadratic tetrahedron element. I need to get the iteroplation fast and accurate. I only find ...
Tang Laoya's user avatar
11 votes
1 answer
12k views

Forcing FindRoot to return only real solutions

FindRoot documentation reports that if the equation and the initial point are reals, the solutions are searched in the real domain. However, in the following case I ...
Fabio Dalla Libera's user avatar
4 votes
2 answers
2k views

How to obtain numerical solutions of a two-variable equation?

I have a two-variable function: f[x_, y_] := (4 y^2 - 6) (Cos[y π] Cos[x] - Cos[2 y π] Sin[x]) How can I find all the numerical solutions for $x$ and $y$ such ...
user avatar
3 votes
5 answers
243 views

Numerical solution of the inverse contour plot

I have a function $f(u,v)$ on some domain of $(u,v)$ and would like to find (numerically) the set of couples* $(u_0,v_0)$ s.t. $f(u_0,v_0)=0$, for instance (just and example to illustrate, in practice ...
Daniel Castro's user avatar
3 votes
2 answers
540 views

Finding Real Roots and Determining Range

I am interested in determining the minimum and maximum values of the real roots of polynomials of form $P(x)=\sum_{k=0}^n a_{k} x^k$ where $n$ will have a defined value (say 3,4,5...) and $a_k$ are ...
David_Shmij's user avatar
2 votes
0 answers
3k views

FindRoot in range

I am trying to find all roots in a range, using y /. FindRoot[Sin[y] == 0, {y, #}] & /@ Range[7] which gives ...
martin's user avatar
  • 8,678
0 votes
0 answers
2k views

Multiple ranges in one plot [duplicate]

Possible Duplicate: 1 Plot, 2 Scale/Axis Generating a broken or snipped axis in ListPlot I have data in several ranges which I, when I plot together, is not very useful. I was thinking about ...
n3rd's user avatar
  • 251
4 votes
2 answers
367 views

how to find numerical zeros of $f(z)$ in a compact complex domain [duplicate]

I encountered a function $f(z)$ with several zeros in a region $1<\Re(z)<2, 3<\Im(z)<4$. These zeros are visible in a three dimensional plot like ...
mike's user avatar
  • 303
1 vote
3 answers
470 views

Fastest way to find roots

I'm working with generative polynomials, and would like to know if there is a faster way to calculate roots. Using the technique below I've managed to cut the time down significantly. However at n=35, ...
Daniel's user avatar
  • 115
0 votes
1 answer
719 views

How can I obtain the complex root of an equation with FindRoot

I want to obtain the complex roots of some equations that are similar,but each of them has a different condition. this difference is the value of α in these ...
morteza's user avatar
2 votes
1 answer
63 views

Selecting results according to the constraint [duplicate]

It is very likely that this question is a duplicate, but unfortunately I have not found the solution. Among the results of a Solve, I would like to apply for the ...
LCarvalho's user avatar
  • 9,233