# How to find the Intersection between curves and yline ?

2 views (last 30 days)
Jenifer NG on 22 Aug 2022
Commented: Jenifer NG on 22 Aug 2022
Hi All,
I want to find the Intersection value of these curves and yline(0.1).
This is my code:
lst = {'0.54','0.55','0.56','0.57','yline'}
plot(m4)
yline(0.1,LineWidth=1.5,LineStyle="--")
legend(lst)
Thanks and Regard!
Han

Chunru on 22 Aug 2022
Edited: Chunru on 22 Aug 2022
lst = {'0.54','0.55','0.56','0.57','yline'}
lst = 1×5 cell array
{'0.54'} {'0.55'} {'0.56'} {'0.57'} {'yline'}
plot(m4)
yline(0.1,LineWidth=1.5,LineStyle="--")
legend(lst)
for i=1:size(m4, 2)
F = griddedInterpolant(1:size(m4, 1), m4(:, i));
[~, x0] = min(abs(m4(:, i) - 0.1)); % coarse estimate
x(i) = fsolve(@(x) F(x)-0.1, x0); % finer solution
end
Equation solved. fsolve completed because the vector of function values is near zero as measured by the value of the function tolerance, and the problem appears regular as measured by the gradient. Equation solved. fsolve completed because the vector of function values is near zero as measured by the value of the function tolerance, and the problem appears regular as measured by the gradient. Equation solved at initial point. fsolve completed because the vector of function values at the initial point is near zero as measured by the value of the function tolerance, and the problem appears regular as measured by the gradient. Equation solved. fsolve completed because the vector of function values is near zero as measured by the value of the function tolerance, and the problem appears regular as measured by the gradient.
x
x = 1×4
52.9828 59.1347 66.0000 69.8486
hold on
xline(x)
Jenifer NG on 22 Aug 2022
it works nice thanks bro!

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