Plot eigen Vector e1 & e2 in matlab?

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Tanya
Tanya 2014-2-18
回答： jandas 2014-2-19
How to be able plot eigen vector in Matlab an make it sure have the exact position as a new axes of our data??
here is my code for PCA
a= randn(100,3);
b=mean(a);
c=cov(a);
[vec,val] = eigs(c);
e1=vec(:,1);
e2=vec(:,2);
plot3(a(:,1),a(:,2),a(:,3),'ro');
hold on
%%Here is the Problem begins
plot(e1,'k--');
plot(e2,'k--');
Here is the output that I got
That two lines represent the e1&e2 .
How to plot the e1 & e2 properly in 3D Vectors (plot3)???

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回答（1 个）

jandas
jandas 2014-2-19
The problem is that you try to plot the vector using 2D line plot so your script actually plots two lines in the XY plane through points {1, e1(1)}, {2, e1(2)}, {3, e1(3)} and {1, e2(1)}, {2, e2(2)}, {3, e2(3)}. If you need to plot a 3D vector you can plot it as a line between two points, e.g.:
plot3([0; e1(1)], [0; e1(2)], [0; e1(3)], 'k--');
plot3([0; e2(1)], [0; e2(2)], [0; e2(3)], 'k--');

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