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plotting new axis given a DCM

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Melissa 2013-8-30

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Good Morning,

If I am given a coordinate system centered at [0,0,0] and have obtained the cosines of the angles (DCM) how can I apply this to obtain the rotated coordinate system on a plot?

Thanks,

Mel

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Iain 2013-8-30

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Why not plot whatever it is that you want to plot on two separate axes?

Melissa 2013-8-30

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I want to show the new x axis with the other coordinate system.

Iain 2013-8-30

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Plot a unit vector on it?

Melissa 2013-8-30

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I would love to but I don't know how to apply it. Say I have a coordinate system centered at [0,0,0] and I want to extend the new x axis starting from that origin uh how about 100 units given a DCM for the new x axis of [.995 .035 .121]. I dont know how to apply the DCM to that current axis to get that new vector.

Iain 2013-8-30

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在 MATLAB Online 中打开

 OldCords = [0 1;0 0;0 0] %origin, and x = 1 (unit vector)
 NewCords = DCM * OldCords;
 plot3(NewCords(1,:),NewCords(2,:),NewCords(3,:))

Walter Roberson 2013-8-30

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hgtransform() ?

Melissa 2013-8-30

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The DCM should produce a new x axis that is of three rotations right? Shouldn't I have a set of three points that isn't zero?

Melissa 2013-8-30

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Maybe using the quiver function since I thought the DCM was the unit vector if its expressed already in cosines. does this make sense? quiver3(0, 0, 0, .995, .035, .120). Or if I want to extend that 100 units I would just multiply the DCM values by 100?!?

Iain 2013-8-30