Determine dihedral angles of protein

n1=[1.5241    0.2513   -1.5163];  
n2=[1.0454    1.0038    1.0286];

by using this

cos-1(n1.n2/|n1||n2|)

I have to find out the dihedral angles of protein, but when I code this in matlab, I got an error. Can you please do an example for this. Then I can follow.

[KSSV]

http://in.mathworks.com/matlabcentral/answers/323008-yes-iam-back-i-have-found-absolute-value-for-vectors-by-commanding-abs-now-i-could-not-do-divid

Same question.

Answer 1

[Image Analyst]

Check out dot() and norm().