Confusion with SpinCalc angle sign not being mathematical positive

Hi John,

when using the SpinCalc function I experienced the conventions for singed angles are different, meaning sitting on the coordinate-vector and looking into its direction, rotating counterclockwise is positive in the function.

Could you confirm this. The following simple check caused confusion: your function:

    EV = [axis, angle.* 360/(2*pi)]
    OUTPUT = SpinCalc('EVtoDCM', EV, 1e-2, 0)

double check via elementary rotation matrix:

rx = angle;
Rx = [1 0 0;0 cos(rx) -sin(rx);0 sin(rx) cos(rx)]

I get these contradicting values: When

    axis =

     1     0     0

    angle =

    1.5708

    EV =

       1     0     0    90

OUTPUT =

      1.0000         0         0
           0    0.0000    1.0000
           0   -1.0000    0.0000

Rx =

      1.0000         0         0
           0    0.0000   -1.0000
           0    1.0000    0.0000

What do you think about the signs of the angles?