Angle between 2 lines
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How can i calculate the angle between such two lines.is the dotvector method useful in such case?
line([50 50],[1 10000],'Color','G');
line([newBoxPolygon(1, 1) newBoxPolygon(4, 1)],[newBoxPolygon(1, 2) newBoxPolygon(4, 2)],'Color','G');
i tried this method
u=[newBoxPolygon(1, 1) newBoxPolygon(4, 1),newBoxPolygon(1, 2) newBoxPolygon(4, 2)]
v=[[50 50],[1 10000]]
CosTheta = dot(u,v)/(norm(u)*norm(v));
ThetaInDegrees = acos(CosTheta)*180/pi
but i'm getting an error can you please help
回答(1 个)
Jos (10584)
2014-2-19
编辑:Jos (10584)
2014-2-19
You want to enter the direction vectors U and V into the formula
dU = [diffUx diffUy]
dV = [diffVx diffVy]
cosTheta = dot(dU,dV) ./ (norm(dU) * norm(dV))
4 个评论
Jos (10584)
2014-2-24
You are setting up the vectors the wrong way: the direction vectors dU and dV should be 2 element arrays. dU is, but dV is not.
If you remove the semi-colons you see what I mean.
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