# Calculating arc length of a curve

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Hari krishnan 2018 年 11 月 19 日
コメント済み: Hari krishnan 2018 年 11 月 19 日
I have the trajectory for an object moving on a plane as shown in the figure. Can any one give me an idea to calculate the arc length of this curve? Sample data along with the trajectory plot is attached.

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### 採用された回答

Torsten 2018 年 11 月 19 日
Use Pythagoras' theorem:
n = numel(x);
length = 0.0;
for i = 1:n-1
length = length + sqrt( (x(i+1)-x(i))^2 + (y(i+1)-y(i))^2 );
end

#### 6 件のコメント

Hari krishnan 2018 年 11 月 19 日
If i want to find out how tortous tis trajectory is, what i thought was to find the arc length and then divide this by the eucledian distance between the initial and final point. This is how i was thinking about sinusoidity
Torsten 2018 年 11 月 19 日
https://en.wikipedia.org/wiki/Curvature
Hari krishnan 2018 年 11 月 19 日
@ Torsten, I have seen this before. This is to calculate how curvous the trajectory or line is. But what i want to see is how tortous the trajectory is, which can be calculated as the arc length divided by the eucledian distance between the initial and final set of points.

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