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Can somebody help me to modify this code?

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Darsana P M
Darsana P M on 2 May 2018
Closed: MATLAB Answer Bot on 20 Aug 2021
I am working with quaternion calculus. So inorder to find the quaternion rotation matrix,
Brot = q.B.(q^-1)
then to find B,
B = (q^-1). Brot.q
I was trying to find these values B and Brot in matlab. But I got different answers. Can somebody tell me the cause for the mistake?
q1=[4 3 2 6];
q2= qInv(q1);
B=[1 2 3;4 5 6;7 8 9];
Q1=q1(2:4);
Q2=q2(2:4);
J= Q1*B;
JJ=J*Q2;
KK= Q2*JJ;
JK= KK*Q1;
Can somebody help me to solve this?

Answers (1)

James Tursa
James Tursa on 22 May 2020
In this
Brot = q.B.(q^-1)
and this
B = (q^-1). Brot.q
expression, the dot (.) is likely supposed to represent quaternion multiply, not standard matrix multiply as you seem to be doing.

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