MATLAB: Need to find x intercepts Using Matlab

find x intercepts

Hi,

I have the following function and I am supposed to find the # of x intersects within the domain of [-20, 5].

3*x^2-1 = exp(-0.5*x)

I have the following commands typed into my script.

func = inline('3*x^2-1-exp(-0.5*x)')
fzero(func,[-20,5])

I am getting only 1 value showing me the x intercept but i am sure there are more than 1 intercepts.

How can i find all the x Intercepts.

PLEASE HELP…!!

Best Answer

fzero() only calculates one intercept.

Plot the function and use the result to divide the distance between [-20, 5] into as many sub-ranges as necessary, each containing one intercept. Then fzero() over each of those sub-ranges.

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MATLAB: Find all the roots of the following function in the interval 0.5<=x<=5. f(x)=(2/x-x)cos(x)+0.0119. Each root must be accurate to a minimum of six significant figures. I really can't figure it out.

Plot the graph for f(x) in [0.5:5], choose intervals that contain only one of the roots and use MATLAB's fzero together with the intervals as initial condition to locate the roots exactly.

Best wishes

Torsten.

MATLAB: How to interpret an answer given by the “regress” function

Your design matrix should be 60x5, not 60x4, you need a column of ones for the constant term, a0.

So start by doing the following:

 x = ones(60,5);

then fill columns 2 to 5 with your x1, x2, x3, and x4 predictors.

Best Answer

Related Solutions

MATLAB: Find all the roots of the following function in the interval 0.5<=x<=5. f(x)=(2/x-​x)cos(x)+0​.0119. Each root must be accurate to a minimum of six significant figures. I really can't figure it out.

MATLAB: How to interpret an answer given by the “regress” function

Related Question

MATLAB: Find all the roots of the following function in the interval 0.5<=x<=5. f(x)=(2/x-x)cos(x)+0.0119. Each root must be accurate to a minimum of six significant figures. I really can't figure it out.