S.theta: Rotate around vertical axis by theta degrees
In p3d: Plot 3d data and fitted surfaces

Description Usage Arguments Details Value Author(s) See Also Examples

Calculates the matrix to rotate around the vertical axis of a 3D plot by theta degrees

1	S.theta(theta)

theta

Angle of rotation

The userMatrix for spinning has the form E.phi(phi) %*% S.theta(theta)

Returns the 4 x 4 rotation matrix

Georges Monette

E.phi, ~~~

##---- Should be DIRECTLY executable !! ----
##-- ==>  Define data, use random,
##--	or do  help(data=index)  for the standard data sets.

## The function is currently defined as
function( theta ) {
    # rotate through vertical axis through phi degrees
    theta = theta *2*pi/360
    cbind( c(cos(theta), 0,sin(theta),0), c(0,1,0,0), c(-sin(theta), 0, cos(theta),0), c(0,0,0,1))
  }