Haw can I calculate the difference between two points in a plot?

Hi

I would like to get the code for calculating the difference between point A and B in a plot.

I can identify them by looking at the plot, but since I have big data and the points’ position changes every time, it would be nice if I can do them more objectively with codes.

X= time

Y= degrees

I have attached the data and a figure

Thank you for your help

Answer 1

[Ildeberto de los Santos Ruiz]

Try this:

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plot(...)

[x,y] = ginput(2); % clic on each point

dx = diff(x)

dy = diff(y)

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Enjoy!!!

Answer 2

[KALYAN ACHARJYA]

You can do that in number of ways

1. If you know the corresponding x values of A and B,let say d1 and d2 them

idx1=find(x==d1);
idx2=find(x==d2);
result=y(idx1)-y(idx2)

2. If not find the diff of y, where maximum two change occurs, might be A and B, then follow last step of 1.

3. Find Peaks (see the documentation)