Talk:Direction cosine

Notation
I think $$\alpha$$, $$\beta$$ and $$\gamma$$ should represent angles instead of their cosine values. If they represent angles, then $$\alpha$$, $$\beta$$ and $$\gamma$$ will mean $$\langle \mathbf{v}, \hat{x}\rangle$$, $$\langle \mathbf{v}, \hat{y}\rangle$$ and $$\langle \mathbf{v}, \hat{z}\rangle$$ respectively. I suggest we write $$ a = \cos\alpha $$ and etc. instead. FrenzY DT (talk) 12:36, 3 October 2012 (UTC)

This article needs an explaining picture. — Preceding unsigned comment added by 129.69.222.156 (talk) 13:12, 22 January 2013 (UTC)


 * I'll make one now. M&and;Ŝc2ħεИτlk 17:02, 15 June 2013 (UTC)


 * Done. Also fixed the silly usage of tensor index notation (v1, v2, v3) and Cartesian labels (vx, vy, vz) on the vector coordinates, as well as the basis notation "i, j, k" and "x, y, 'z" to "ex, ey, ez". Either use one notation or the other throughout, and not a mixture. M&and;Ŝc2ħεИτlk 18:07, 15 June 2013 (UTC)

Direction cosine vs direction cosines
The title seems wrong - I suggest it should be "Direction Cosines." A "direction cosine" by itself has no meaning except in the context of the 3D case. Even in 2D there is no "direction cosine" as the angles would be complementary. — Preceding unsigned comment added by Bubsir (talk • contribs) 19:13, 23 November 2015 (UTC)