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How to extract X value given Y value from graph.

18 次查看（过去 30 天）
ulas can ozak
ulas can ozak 2022-12-11
评论： Star Strider 2022-12-11
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

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回答（1 个）

Star Strider
Star Strider 2022-12-11
Ran in:
%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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