How to find the Intersection between curves and yline ?

Hi All,

I want to find the Intersection value of these curves and yline(0.1).

Could Anyone please help me ?

This is my code:

load matlab

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

Answer 1

[Chunru]

load matlab
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]

it works nice thanks bro!