help using fzero to find the intersection

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Ziad Badreldeen 2020-5-29

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https://ww2.mathworks.cn/matlabcentral/answers/537155-help-using-fzero-to-find-the-intersection

回答： Star Strider 2020-5-29

i basically want to use fzero in order to find the coordinates of intersection between 2 graphs plotted together on the same figure can someone please explain how this is carried out

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Answer 1

KSSV 2020-5-29

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https://ww2.mathworks.cn/matlabcentral/answers/537155-help-using-fzero-to-find-the-intersection#answer_441999

Try this:

https://in.mathworks.com/matlabcentral/fileexchange/22441-curve-intersections?focused=5165138&tab=function

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Ziad Badreldeen 2020-5-29

the question requires we use the fzero function for the problem

KSSV 2020-5-29

so attach your data..to find out whether fzero helps.

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Answer 2

Star Strider 2020-5-29

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https://ww2.mathworks.cn/matlabcentral/answers/537155-help-using-fzero-to-find-the-intersection#answer_442199

在 MATLAB Online 中打开

At the intersections, the difference between the functions is 0, and since fzero is a root-finding algorithm, choose and appropriate starting poiint and use it to find the intersections:

f = @(x) x.^2 - 2;
g = @(x) sin(2*pi*x/10);
for k = 1:2
    xint(k) = fzero(@(x)f(x)-g(x), 5*(-1)^k);       % Calculate ‘x’ At The Intersections
end
x = linspace(-2, 2);
figure
plot(x, f(x),    x, g(x))
hold on
plot(xint, f(xint), 'gp')                           % Choose Either Function To Plot The Intersections
hold off
grid