Cross Product is Returning Values way to small to be right

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Pete
Pete 2018-8-29
评论： Steven Lord 2018-8-29
Hi,
I am trying to determine the cross product of two vectors while having MATLAB calculate the components and then cross them. Every time it runs it spits out an answer like 1.0e-15. Does anyone know what is causing this? I'm new to MATLAB and all help is appreciated.
clear all;
close all;
A=2.8;
B=1.9;
Ax=A*cos(60*(180/pi)); %Finds the x component to vector A
Ay=A*sin(60*(180/pi));
Az=0;
Bx=B*cos(60*(180/pi)); %Finds the x component to vector A
By=B*sin(60*(180/pi));
Bz=0;
A=[Ax Ay Az];
B=[Bx By Bz];
C=cross(A,B);
disp (C);

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采纳的回答

James Tursa
James Tursa 2018-8-29
Your vectors are parallel to each other, so the answer should be 0. The small number you are getting is just from floating point calculation effects.
Also, your apparent conversion from degrees to radians is backwards. You need the factor to be (pi/180) instead of the (180/pi) you are currently using.
  1 个评论
Steven Lord
Steven Lord 2018-8-29
Rather than converting from degrees to radians, use the degree-based trig functions sind and cosd instead of the radian-based sin and cos.

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