How to do distance formula

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Kaden Bauernfeind
Kaden Bauernfeind 2022-3-28
评论： Rik 2022-3-28
Im trying to find the distance between 2 points on a truss and I have the length and the x and y of the nodes on the truss but what code in matlab would make this work.
I know
d = sqtrt((x2-x1)^2+(y2-y1)^2) ;
But how would I apply it to an array on a truss
with x being the nodes and e being the edges or lines that connect nodes
X = [0 0
1 0
2 0
2 1
1 1
0 1
];
e = [1 2
2 3
3 4
4 5
5 6
6 1
2 4
3 5
1 5
2 6];
I just dont seem to get how to put these two together and make a distance formula that works. The lengths of these points are the outside lengths are 1 m and the cross section lengths are the sqrt of 2(these inside ones being from 1 to 5, 6 to 2, 4 to 2, and 5 to 3.
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Kaden Bauernfeind
Kaden Bauernfeind 2022-3-28
writing a loop
I under stand that it would be a for loop but how I would apply the i is kinda what confuses me
example
for i = 1:n
i know thats how its formated I just dont know what the 1:n means.
Rik
Rik 2022-3-28
If you have trouble with Matlab basics you may consider doing the Onramp tutorial (which is provided for free by Mathworks). That should help with tasks like this.

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回答（1 个）

Matt J
Matt J 2022-3-28
A=pdist2(X,X);
distances = A( sub2ind(size(A) ,e(:,1),e(:,2) ) )

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