Array of x and y values. Find value of y when x=0, how?
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Hello. I have an assignment in school, where we got an array with x and y values to plot.
Time=[0.5:0.5:5];
A=[1.2 0.73 0.45 0.27 0.16 0.11 0.06 0.035 0.022 0.013];
plot(Time,A) gives me a graph but I need the value of A when Time=0;
I don't have a function or equation, only these values. So when Time=0, what is the value of A?
I'm thinking that some kind of y-intercept thing can be the solution?
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Answers (2)
KL
on 27 Nov 2017
You might want to use interp1,
Hint: For your case, 0 lies outside the range you've got, so you might want to extrapolate.
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KL
on 28 Nov 2017
I agree with the cyclist. In your question you say ...I don't have a function or equation, only these values... and looks like you do have one.
the cyclist
on 27 Nov 2017
Strictly speaking, it is not possible to know what the value of A is at Time=0, given only this information. An infinite number of functions could fit these data, and give different values at Time=0. Or maybe Time=0 is an asymptote, and the fit line never crosses it.
Do you have any other relevant info that you have not shared?
2 Comments
the cyclist
on 27 Nov 2017
Fantastic.
If you take the log of each side of that equation, you get
log(A) = log(A0) - k*time
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