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How to find x,y coordinates.

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Ariane
Ariane am 20 Feb. 2023
I have to find x,y coordinates for 3 data points where the slope of my function changes. When I just click on the points, I can see the x,y coordinates but I was wondering if there is a better way to do it that will be more accurate. I created this plot like this plot(distance,T,'-k')
  2 Kommentare
Torsten
Torsten am 20 Feb. 2023
Depends on how the plot was created ...
Torsten
Torsten am 20 Feb. 2023
So "distance" and "T" are known arrays of numerical values ?

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Sulaymon Eshkabilov
Sulaymon Eshkabilov am 20 Feb. 2023
(1) Using the data to be plotted
y = @(t)2*t.^2+3*t-5;
t = 0:2:8;
f = y(t);
tnew = 0:.2:8;
y = interp1(t, f, tnew);
figure
plot(t,f, 'k-')
hold on
plot(t,f, 'ro', 'markerfacecolor', 'y', 'MarkerSize', 9)
xlabel('t')
ylabel('y(t)')
hold off
(2) Graphical and approximate approach is ginput()
y = @(t)2*t.^2+3*t-5;
t = 0:2:8;
f = y(t);
tnew = 0:.2:8;
y = interp1(t, f, tnew);
figure
plot(tnew,y, 'k-', 'linewidth', 2)
N = 4; % Number of data points to be located with ginput()
[xx, yy] = ginput(N);

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