How to extract X value given Y value from graph.

I want to find x value given y value,

%Finding X value with known Y value on plot
clc; clear all; close all;
x= 0:0.01:5;
y= [0.2 0.4 0.7 0.9 1.0]
[X, Y] = meshgrid(x);
A = ((1)./(1+5.*((x-5).^2)));
B = (2.^(-x));
C = ((2.*x)./(x+5));
plot(x, A, 'DisplayName', 'A')
hold on
plot(x, B, 'DisplayName', 'B')
hold on
plot(x, C, 'DisplayName', 'C')
hold on
title('A - B - C')
legend

[KSSV]

Read about interp1

[ulas can ozak]

Can you share an aplication sample.

Answer 1

[Star Strider]

%Finding X value with known Y value on plot
clc; clear all; close all;
x= 0:0.01:5;
y= [0.2 0.4 0.7 0.9 1.0]

y = 1×5

0.2000 0.4000 0.7000 0.9000 1.0000

[X, Y] = meshgrid(x);
A = ((1)./(1+5.*((x-5).^2)));
B = (2.^(-x));
C = ((2.*x)./(x+5));

ABC = [A; B; C];
for k = 1:size(ABC,1)
    xv(k,:) = interp1(ABC(k,:), x, y);
    yv(k,:) = interp1(x, ABC(k,:), xv(k,:));
end

xv

xv = 3×5

4.1055 4.4523 4.7072 4.8509 5.0000 2.3219 1.3219 0.5146 0.1520 0 0.5556 1.2500 2.6923 4.0909 5.0000

yv

yv = 3×5

0.2000 0.4000 0.7000 0.9000 1.0000 0.2000 0.4000 0.7000 0.9000 1.0000 0.2000 0.4000 0.7000 0.9000 1.0000

plot(x, A, 'DisplayName', 'A')
hold on
plot(x, B, 'DisplayName', 'B')
hold on
plot(x, C, 'DisplayName', 'C')
hold on
plot(xv, yv, 's', 'DisplayName','Intersections')
title('A - B - C')
legend('Location','eastoutside')
plot(x,ones(numel(x),1)*y, ':k', 'DisplayName','Y Vector')
axis('padded')

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[ulas can ozak]

Thank you very much. Best wishes.

[Star Strider]

My pleasure!

If my Answer helped you solve your problem, please Accept it!

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