Find intersection of points in a graph

Question

Chinmayraj Doddarajappa 2022-7-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1755705-find-intersection-of-points-in-a-graph

回答： Hrusheekesh 2022-7-11

采纳的回答： Star Strider

Is there a way to find the intersection of two curves in the graph? If yes, can someone help me with the code

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Answer 1

Star Strider 2022-7-8

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https://ww2.mathworks.cn/matlabcentral/answers/1755705-find-intersection-of-points-in-a-graph#answer_1002775

在 MATLAB Online 中打开

It would help to have the actual data. Assuming that ‘y2’ is either a constant or a line defined as a function of the same independent variable values as ‘y1’, this is straightforward —

x = linspace(0, 9); % Independent Variable

y1 = 700*exp(-0.45*x); % Curve

y2 = 150; % Line

xint = interp1(y1-y2, x, 0) % X-Intercept (Interpolation)

xint = 3.4236

figure

plot(x, y1, [0 9], [1 1]*y2, xint, y2, 'sr')

legend('y_1', 'y_2', 'Intersection', 'Location','best')

text(xint, y2, sprintf(' \\leftarrow Intersection: X = %.3f',xint), 'Horiz','left', 'Vert','middle', 'Rotation',30)

See the documentation on the interp1 function for details.

If both lines are defined on different independent variable values, a separate intermediate interpolation to define them with respect to the same independent variable vector (using interp1) would be required first.

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