E.phi: Incline horizontal plane by phi degree
In p3d: Plot 3d data and fitted surfaces

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

Calculates the matrix to incline the horizontal plane of a 3D plot by phi degree

1	E.phi(phi)

phi

Angle, in degrees.

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

Returns the 4 x 4 rotation matrix

Georges Monette

S.theta, ~~~

##---- 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( phi ) {
    # incline horizontal plane by phi degrees
    # note that userMatrix for spinning has form E.phi %*% S.theta
    phi = phi *2*pi/360
    cbind(c(1,0,0,0), c(0,cos(phi),sin(phi),0),  c(0,-sin(phi), cos(phi),0), c(0,0,0,1))
  }