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Average distance from the origin

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TS
TS 2015-5-4
评论： Star Strider 2015-5-4
matrix=load('Data');
x = matrix(:,1);
y = matrix(:,2);
distances = sqrt((x-0).^2 + (y-0).^2)
sum(distances)./(size(matrix))
Hey, so I just wanted to make sure I'm doing this correctly. What I'm trying to do is find the average distance between points in a matrix and the origin. I got an answer I'm not quite sure about being correct, so I wanted to be safe.

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Star Strider
Star Strider 2015-5-4
You seem to be doing it correctly, but if you can use the built-in functions, I would use hypot and mean:
distances = hypot(x,y);
avg_dist = mean(distances);
  2 个评论
TS
TS 2015-5-4
Oh! Thank you! I completely forgot that there were built in functions for this!

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更多回答（1 个）

Chad Greene
Chad Greene 2015-5-4
Looks right, but you could write it more simply:
matrix=load('Data');
x = matrix(:,1);
y = matrix(:,2);
distances = hypot(x,y);
mean(distances)

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