Intersection point of two lines from the data set.
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Hi, How points on a line can be calculated if you are given the lower(x1,y1) and the upper(x2,y2) points and a given speed from (x1,y1)to(x2,y2).
if you can guide. ?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/153648/image.png)
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Star Strider
2016-1-28
For a linear plot like that, the easiest way would be to use the polyfit and polyval functions:
p = polyfit([x1; x2], [y1; y2], 1); % Fit Line To Known Points With Linear Approximation
x3 = ... SOME POINT OR VECTOR OF POINTS ...; % Desired ‘x’ Values
y3 = polyval(p, x3); % Calculate ‘y’ Values
If ‘x’ is time and ‘y’ is position, the speed will be given by ‘p(1)’.
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Star Strider
2016-1-28
I would use the interp1 function:
x = [0.0988 0.0442];
y = [8.2928 8.2941];
t = [4.8133 5.9180];
tq = 5.5;
xy = interp1(t', [x; y]', tq)
xy =
64.8597e-003 8.2936e+000
I’m still not certain I’m understanding the problem, but this seems at least to be working toward a solution.
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