Calculationg with quternions Matlab function did not work

Hello,

I am having some trouble with my function. I would transform a coordinate vector using Unit Quaternions.

I have written this function:

function p_A = q_transform_coordinate_vector(R_A_B, p_B)
p_A = q_A_B * q_pure(p_B) * q_inv(q_A_B);
end

But this function is not workin. It appears this error message:

Unrecognized function or variable 'q_A_B'.

Error in test_fehler>q_transform_coordinate_vector (line 102)

p_A = q_A_B * q_pure(p_B) * q_inv(q_A_B);

Error in test_fehler (line 47)

p_A = q_transform_coordinate_vector(R_A_B, p_B)

I did get it why I get this error message. Maybe someone can have a look and tell me what I am doing wrong. Thanks :)

.

Answer 1

[Jan]

function p_A = q_transform_coordinate_vector(R_A_B, p_B)
%                                            ^^^^^
p_A = q_A_B * q_pure(p_B) * q_inv(q_A_B);
%     ^^^^^                       ^^^^^^
end

You provide R_A_B as input, but use q_A_B.

[Mark S]

Thanks