Linked Questions

3
votes
1answer
935 views

FindRoot giving false roots with Bessel Functions [duplicate]

I have read in some places about the errors associated with FindRoot, but the closest thing I can find on this website seems to be due to the imaginary unit. I am dealing with what should be a ...
1
vote
2answers
615 views

Finding roots of a function that includes Bessel functions [duplicate]

I'm fairly new to Mathematica so forgive any stupid mistakes. Here's my function: ...
2
votes
1answer
278 views

Finding all roots to equation [duplicate]

I'm currently doing some Mathematica exercises, and I'm stuck on this one task where you're supposed to plot the functions h(t)= |3-t^2|+|t-1|-t^2 , g(t)=3sin(t) in the same grap, and then find all ...
2
votes
2answers
147 views

Problem with NSolve Speed [duplicate]

I have a very complicated function but only of 1 variable. I want to find the first value for which that function is zero. Mathematica can easily plot it: ...
0
votes
2answers
636 views

Finding points of intersection of a function and x-axis [duplicate]

I have a function of the form $2e^{-x}\cos(10x)-1$. I want to find all (or atleast some of ) the points where this function meets the $x$-axis. If I plot this function, I can see that it crosses $x$-...
1
vote
1answer
152 views

Finding all positive roots of a transcendental equation [duplicate]

I need to find all positive roots of the following transcendental equation 2*cot(x) = 6.4*x-0.1563/x I know that the roots can be visualised as the intersecting ...
0
votes
0answers
155 views

Probleme with Ted Ersek's RootSearch package [duplicate]

The following question is a logical continuation of this one. The Ted Ersek's RootSearch package doesn't work with this code: ...
4
votes
1answer
115 views

Creating a For Loop for a equation that has many solutions [duplicate]

I have two equations like these. I want to create a for loop that gives to me all intersection points of the two equations. How can I do that? ...
0
votes
0answers
101 views

Finding roots by solving its ODEs [duplicate]

Roots of fluctuating function (p,q real) needed to evaluate eigenvalues of $$ y(x) = \dfrac{\sin px }{p} + \dfrac {\sin q x }{q} =0 ...(1*) $$ form a real and complex infinite set. The way to ...
0
votes
1answer
63 views

Finding different roots of an equation [duplicate]

I have an equation and I want to solve it with FindRoot but is there any way to give a range to FindRoot instead of giving a point? this is my MMA code: ...
-1
votes
1answer
55 views

Finding all roots of a function within an interval [duplicate]

I have the following code: ...
0
votes
1answer
39 views

points of intersection along curve and horizontal line [duplicate]

I'm trying to find the intersection points of the following plot with the given boundaries. How would I do so in the bounds set by the above plot? I've tried FindRoot by setting the lines equal to ...
1
vote
0answers
25 views

find the first several roots of a function [duplicate]

I have a function like this: How to find the first several roots (that is larger than 0) of it? Using FindRoot, it's difficult to localize to the root I want.
77
votes
9answers
5k views

Updating Wagon's FindAllCrossings2D[] function

Stan Wagon's Mathematica in Action (second edition; I haven't read the third edition and I'm hoping to eventually see it), demonstrates a nifty function called ...
72
votes
5answers
23k views

How to find all the local minima/maxima in a range

I want to find : all local maxima in range all local minima in range From those points I can interpolate and combine functions upper and lower boundary. What I am really interested in, is the mean ...

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